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<H1 ALIGN="CENTER"><SPAN CLASS="textbf">Gnuplot</SPAN> FAQ</H1>
<DIV CLASS="author_info">
</DIV>
<P>
This document deals with <SPAN CLASS="textbf">gnuplot</SPAN> version 4.4 which is the
latest official release as of March 2010.
<BR>
Its version is
<code>$Revision: 1.40 $</code>, dated
<code>$Date: 2010/03/14 06:59:57 $</code>.
<P>
<BR>
<H2><A NAME="SECTION00010000000000000000">
Contents</A>
</H2>
<!--Table of Contents-->
<UL CLASS="TofC">
<LI><A NAME="tex2html153"
HREF="faq.html#SECTION00020000000000000000">0 Meta - Questions</A>
<UL>
<LI><A NAME="tex2html154"
HREF="faq.html#SECTION00021000000000000000">0.1 Where do I get this document?</A>
<LI><A NAME="tex2html155"
HREF="faq.html#SECTION00022000000000000000">0.2 Where do I send comments about this document?</A>
</UL>
<BR>
<LI><A NAME="tex2html156"
HREF="faq.html#SECTION00030000000000000000">1 General Information</A>
<UL>
<LI><A NAME="tex2html157"
HREF="faq.html#SECTION00031000000000000000">1.1 What is gnuplot?</A>
<LI><A NAME="tex2html158"
HREF="faq.html#SECTION00032000000000000000">1.2 How did it come about and why is it called gnuplot?</A>
<LI><A NAME="tex2html159"
HREF="faq.html#SECTION00033000000000000000">1.3 What does gnuplot offer?</A>
<LI><A NAME="tex2html160"
HREF="faq.html#SECTION00034000000000000000">1.4 Is gnuplot suitable for scripting?</A>
<LI><A NAME="tex2html161"
HREF="faq.html#SECTION00035000000000000000">1.5 Can I run gnuplot on my computer?</A>
<LI><A NAME="tex2html162"
HREF="faq.html#SECTION00036000000000000000">1.6 Legalities</A>
<LI><A NAME="tex2html163"
HREF="faq.html#SECTION00037000000000000000">1.7 Does gnuplot have anything to do with the FSF and the GNU
project?</A>
<LI><A NAME="tex2html164"
HREF="faq.html#SECTION00038000000000000000">1.8 Where do I get further information?</A>
</UL>
<BR>
<LI><A NAME="tex2html165"
HREF="faq.html#SECTION00040000000000000000">2 Setting it up</A>
<UL>
<LI><A NAME="tex2html166"
HREF="faq.html#SECTION00041000000000000000">2.1 What is the current version of gnuplot?</A>
<LI><A NAME="tex2html167"
HREF="faq.html#SECTION00042000000000000000">2.2 Where can I get gnuplot?</A>
<LI><A NAME="tex2html168"
HREF="faq.html#SECTION00043000000000000000">2.3 Where can I get current development version of gnuplot?</A>
<LI><A NAME="tex2html169"
HREF="faq.html#SECTION00044000000000000000">2.4 How do I get gnuplot to compile on my system?</A>
<LI><A NAME="tex2html170"
HREF="faq.html#SECTION00045000000000000000">2.5 What documentation is there, and how do I get it?</A>
<LI><A NAME="tex2html171"
HREF="faq.html#SECTION00046000000000000000">2.6 Worked examples</A>
<LI><A NAME="tex2html172"
HREF="faq.html#SECTION00047000000000000000">2.7 How do I modify gnuplot, and apply 'patches'?</A>
</UL>
<BR>
<LI><A NAME="tex2html173"
HREF="faq.html#SECTION00050000000000000000">3 Working with it.</A>
<UL>
<LI><A NAME="tex2html174"
HREF="faq.html#SECTION00051000000000000000">3.1 How do I get help?</A>
<LI><A NAME="tex2html175"
HREF="faq.html#SECTION00052000000000000000">3.2 How do I print out my graphs?</A>
<LI><A NAME="tex2html176"
HREF="faq.html#SECTION00053000000000000000">3.3 How do I include my graphs in <word processor>?</A>
<LI><A NAME="tex2html177"
HREF="faq.html#SECTION00054000000000000000">3.4 How do I edit or post-process a gnuplot graph?</A>
<LI><A NAME="tex2html178"
HREF="faq.html#SECTION00055000000000000000">3.5 How do I change symbol size, line thickness and the like?</A>
<LI><A NAME="tex2html179"
HREF="faq.html#SECTION00056000000000000000">3.6 Can I animate my graphs?</A>
<LI><A NAME="tex2html180"
HREF="faq.html#SECTION00057000000000000000">3.7 How do I plot implicit defined graphs?</A>
<LI><A NAME="tex2html181"
HREF="faq.html#SECTION00058000000000000000">3.8 How to fill an area between two curves</A>
<LI><A NAME="tex2html182"
HREF="faq.html#SECTION00059000000000000000">3.9 Pm3d splot from a datafile does not draw anything</A>
<LI><A NAME="tex2html183"
HREF="faq.html#SECTION000510000000000000000">3.10 Drawing a (color) map, i.e. 2D projection of 3D data</A>
<LI><A NAME="tex2html184"
HREF="faq.html#SECTION000511000000000000000">3.11 How to overlay dots/points scatter plot onto a pm3d map/surface</A>
<LI><A NAME="tex2html185"
HREF="faq.html#SECTION000512000000000000000">3.12 How to draw black contour plot, and contours with labels</A>
<LI><A NAME="tex2html186"
HREF="faq.html#SECTION000513000000000000000">3.13 How to overlay contour plot over pm3d map/surface</A>
<LI><A NAME="tex2html187"
HREF="faq.html#SECTION000514000000000000000">3.14 Color facets with pm3d</A>
<LI><A NAME="tex2html188"
HREF="faq.html#SECTION000515000000000000000">3.15 Palette for printing my color map on color as well as black&white
printer?</A>
</UL>
<BR>
<LI><A NAME="tex2html189"
HREF="faq.html#SECTION00060000000000000000">4 Wanted features</A>
<UL>
<LI><A NAME="tex2html190"
HREF="faq.html#SECTION00061000000000000000">4.1 What's new in gnuplot 4.2, 4.4 etc?</A>
<LI><A NAME="tex2html191"
HREF="faq.html#SECTION00062000000000000000">4.2 Does gnuplot support a driver for <graphics format>?</A>
<LI><A NAME="tex2html192"
HREF="faq.html#SECTION00063000000000000000">4.3 Does gnuplot have hidden line removal?</A>
<LI><A NAME="tex2html193"
HREF="faq.html#SECTION00064000000000000000">4.4 Does gnuplot support bar-charts/histograms/boxes?</A>
<LI><A NAME="tex2html194"
HREF="faq.html#SECTION00065000000000000000">4.5 Does gnuplot support pie charts?</A>
<LI><A NAME="tex2html195"
HREF="faq.html#SECTION00066000000000000000">4.6 Does gnuplot quarterly time charts?</A>
<LI><A NAME="tex2html196"
HREF="faq.html#SECTION00067000000000000000">4.7 Can I put multiple pages on one page?</A>
<LI><A NAME="tex2html197"
HREF="faq.html#SECTION00068000000000000000">4.8 Does gnuplot support multiple y-axes on a single plot?</A>
<LI><A NAME="tex2html198"
HREF="faq.html#SECTION00069000000000000000">4.9 Can I put both commands and data into a single file?</A>
<LI><A NAME="tex2html199"
HREF="faq.html#SECTION000610000000000000000">4.10 Can I put Greek letters and super/subscripts into my labels?</A>
<LI><A NAME="tex2html200"
HREF="faq.html#SECTION000611000000000000000">4.11 How do I include accented characters</A>
<LI><A NAME="tex2html201"
HREF="faq.html#SECTION000612000000000000000">4.12 Can I do 1:1 scaling of axes?</A>
<LI><A NAME="tex2html202"
HREF="faq.html#SECTION000613000000000000000">4.13 Can I put different text sizes into my plots?</A>
<LI><A NAME="tex2html203"
HREF="faq.html#SECTION000614000000000000000">4.14 How do I skip data points?</A>
<LI><A NAME="tex2html204"
HREF="faq.html#SECTION000615000000000000000">4.15 How do I plot every nth point?</A>
<LI><A NAME="tex2html205"
HREF="faq.html#SECTION000616000000000000000">4.16 How do I plot a vertical line?</A>
<LI><A NAME="tex2html206"
HREF="faq.html#SECTION000617000000000000000">4.17 How do I plot data files</A>
<LI><A NAME="tex2html207"
HREF="faq.html#SECTION000618000000000000000">4.18 How do I replot multiplot drawing</A>
</UL>
<BR>
<LI><A NAME="tex2html208"
HREF="faq.html#SECTION00070000000000000000">5 Miscellaneous</A>
<UL>
<LI><A NAME="tex2html209"
HREF="faq.html#SECTION00071000000000000000">5.1 I've found a bug, what do I do?</A>
<LI><A NAME="tex2html210"
HREF="faq.html#SECTION00072000000000000000">5.2 Can I use gnuplot routines for my own programs?</A>
<LI><A NAME="tex2html211"
HREF="faq.html#SECTION00073000000000000000">5.3 What extensions have people made to gnuplot? Where can I get
them?</A>
<LI><A NAME="tex2html212"
HREF="faq.html#SECTION00074000000000000000">5.4 I need an integration, fft, iir-filter,...!</A>
<LI><A NAME="tex2html213"
HREF="faq.html#SECTION00075000000000000000">5.5 Can I do heavy-duty data processing with gnuplot? or
What is beyond gnuplot?</A>
<LI><A NAME="tex2html214"
HREF="faq.html#SECTION00076000000000000000">5.6 Mouse in my interactive terminal does not work</A>
<LI><A NAME="tex2html215"
HREF="faq.html#SECTION00077000000000000000">5.7 How to use hotkeys in my interactive terminals</A>
<LI><A NAME="tex2html216"
HREF="faq.html#SECTION00078000000000000000">5.8 I have ported gnuplot to another system, or patched it. What
do I do?</A>
<LI><A NAME="tex2html217"
HREF="faq.html#SECTION00079000000000000000">5.9 I want to help in developing the next version of gnuplot.
What can I do?</A>
<LI><A NAME="tex2html218"
HREF="faq.html#SECTION000710000000000000000">5.10 Open questions for inclusion into the FAQ?</A>
</UL>
<BR>
<LI><A NAME="tex2html219"
HREF="faq.html#SECTION00080000000000000000">6 Making life easier</A>
<UL>
<LI><A NAME="tex2html220"
HREF="faq.html#SECTION00081000000000000000">6.1 How do I plot two functions in non-overlapping regions?</A>
<LI><A NAME="tex2html221"
HREF="faq.html#SECTION00082000000000000000">6.2 How do I run my data through a filter before plotting?</A>
<LI><A NAME="tex2html222"
HREF="faq.html#SECTION00083000000000000000">6.3 How do I make it easier to use gnuplot with L<SUP>A</SUP>TEX?</A>
<LI><A NAME="tex2html223"
HREF="faq.html#SECTION00084000000000000000">6.4 How do I save and restore my settings?</A>
<LI><A NAME="tex2html224"
HREF="faq.html#SECTION00085000000000000000">6.5 How do I plot lines (not grids) using splot?</A>
<LI><A NAME="tex2html225"
HREF="faq.html#SECTION00086000000000000000">6.6 How do I plot a function f(x,y) that is bounded by other functions in the x-y plane?</A>
<LI><A NAME="tex2html226"
HREF="faq.html#SECTION00087000000000000000">6.7 How do I turn off <feature> in a plot?</A>
<LI><A NAME="tex2html227"
HREF="faq.html#SECTION00088000000000000000">6.8 How do I call gnuplot from my own programs?</A>
<LI><A NAME="tex2html228"
HREF="faq.html#SECTION00089000000000000000">6.9 What if I need h-bar (Planck's constant)?</A>
<LI><A NAME="tex2html229"
HREF="faq.html#SECTION000810000000000000000">6.10 What if I need the Solar mass symbol?</A>
<LI><A NAME="tex2html230"
HREF="faq.html#SECTION000811000000000000000">6.11 How do I produce blank output page?</A>
<LI><A NAME="tex2html231"
HREF="faq.html#SECTION000812000000000000000">6.12 How do I produce graph of an exact border size?</A>
</UL>
<BR>
<LI><A NAME="tex2html232"
HREF="faq.html#SECTION00090000000000000000">7 Common problems</A>
<UL>
<LI><A NAME="tex2html233"
HREF="faq.html#SECTION00091000000000000000">7.1 Help! None of my fonts work.</A>
<LI><A NAME="tex2html234"
HREF="faq.html#SECTION00092000000000000000">7.2 Gnuplot is not plotting any points under X11! How come?</A>
<LI><A NAME="tex2html235"
HREF="faq.html#SECTION00093000000000000000">7.3 Why does gnuplot ignore my very small numbers?</A>
<LI><A NAME="tex2html236"
HREF="faq.html#SECTION00094000000000000000">7.4 Gnuplot is not plotting on the screen when run from command line via 'gnuplot filename.gp'</A>
<LI><A NAME="tex2html237"
HREF="faq.html#SECTION00095000000000000000">7.5 My formulas (like 1/3) are giving me nonsense results! What's going on?</A>
<LI><A NAME="tex2html238"
HREF="faq.html#SECTION00096000000000000000">7.6 My output files are incomplete!</A>
<LI><A NAME="tex2html239"
HREF="faq.html#SECTION00097000000000000000">7.7 When using the L<SUP>A</SUP>TEX-terminal, there is an error during
the L<SUP>A</SUP>TEX-run!</A>
<LI><A NAME="tex2html240"
HREF="faq.html#SECTION00098000000000000000">7.8 I can't find the demos and example files at the URLs in the
documentation!</A>
<LI><A NAME="tex2html241"
HREF="faq.html#SECTION00099000000000000000">7.9 Calling gnuplot in a pipe or with a gnuplot-script
doesn't produce a plot!</A>
</UL>
<BR>
<LI><A NAME="tex2html242"
HREF="faq.html#SECTION000100000000000000000">8 Credits</A>
</UL>
<!--End of Table of Contents-->
<P>
<H1><A NAME="SECTION00020000000000000000">
<SPAN CLASS="arabic">0</SPAN> Meta - Questions</A>
</H1>
<P>
<H2><A NAME="SECTION00021000000000000000">
<SPAN CLASS="arabic">0</SPAN>.<SPAN CLASS="arabic">1</SPAN> Where do I get this document?</A>
</H2>
<P>
The newest version of this document is on the web at
<A NAME="tex2html1"
HREF="http://www.gnuplot.info/faq/"><TT>http://www.gnuplot.info/faq/</TT></A>.
<P>
This document was/is posted sometimes to the newsgroups
~<A NAME="tex2html2"
HREF="news:comp.graphics.apps.gnuplot"><TT>comp.graphics.apps.gnuplot</TT></A>.
<P>
<H2><A NAME="SECTION00022000000000000000">
<SPAN CLASS="arabic">0</SPAN>.<SPAN CLASS="arabic">2</SPAN> Where do I send comments about this document?</A>
</H2>
<P>
Send comments, suggestions etc via email to the developer mailing list
<A NAME="tex2html3"
HREF="mailto:gnuplot-beta@lists.sourceforge.net"><TT>gnuplot-beta@lists.sourceforge.net</TT></A>.
Please contribute your suggestions with respect to the file <code>faq.tex</code>
available from
<A NAME="tex2html4"
HREF="http://gnuplot.cvs.sourceforge.net/viewvc/gnuplot/faq/"><TT>http://gnuplot.cvs.sourceforge.net/viewvc/gnuplot/faq/</TT></A>.
<P>
<H1><A NAME="SECTION00030000000000000000">
<SPAN CLASS="arabic">1</SPAN> General Information</A>
</H1>
<P>
<H2><A NAME="SECTION00031000000000000000">
<SPAN CLASS="arabic">1</SPAN>.<SPAN CLASS="arabic">1</SPAN> What is <SPAN CLASS="textbf">gnuplot</SPAN>?</A>
</H2>
<P>
<SPAN CLASS="textbf">gnuplot</SPAN> is a command-driven interactive function plotting
program. It can be used to plot functions and data points in
both two- and three-dimensional plots in many different
formats. It is designed primarily for the visual display of
scientific data.
<SPAN CLASS="textbf">gnuplot</SPAN> is copyrighted, but freely distributable;
you don't have to pay for it.
<P>
<H2><A NAME="SECTION00032000000000000000">
<SPAN CLASS="arabic">1</SPAN>.<SPAN CLASS="arabic">2</SPAN> How did it come about and why is it called <SPAN CLASS="textbf">gnuplot</SPAN>?</A>
</H2>
<P>
The authors of <SPAN CLASS="textbf">gnuplot</SPAN> are:
Thomas Williams, Colin Kelley, Russell Lang, Dave Kotz, John
Campbell, Gershon Elber, Alexander Woo and many others.
<P>
The following quote comes from Thomas Williams:
<BLOCKQUOTE>
I was taking a differential equation class and Colin was taking
Electromagnetics, we both thought it'd be helpful to visualize the
mathematics behind them. We were both working as sys admin for an
EE VLSI lab, so we had the graphics terminals and the time to do
some coding. The posting was better received than we expected, and
prompted us to add some, albeit lame, support for file data.
</BLOCKQUOTE>
<P>
<BLOCKQUOTE>Any reference to GNUplot is incorrect. The real name of the program
is "<SPAN CLASS="textbf">gnuplot</SPAN>". You see people use "<SPAN CLASS="textbf">Gnuplot</SPAN>" quite a bit because many
of us have an aversion to starting a sentence with a lower case
letter, even in the case of proper nouns and titles. <SPAN CLASS="textbf">gnuplot</SPAN> is not
related to the GNU project or the FSF in any but the most
peripheral sense. Our software was designed completely
independently and the name "<SPAN CLASS="textbf">gnuplot</SPAN>" was actually a compromise. I
wanted to call it "llamaplot" and Colin wanted to call it "nplot."
We agreed that "newplot" was acceptable but, we then discovered
that there was an absolutely ghastly pascal program of that name
that the Computer Science Dept. occasionally used. I decided that
"<SPAN CLASS="textbf">gnuplot</SPAN>" would make a nice pun and after a fashion Colin agreed.
</BLOCKQUOTE>
<P>
<H2><A NAME="SECTION00033000000000000000">
<SPAN CLASS="arabic">1</SPAN>.<SPAN CLASS="arabic">3</SPAN> What does <SPAN CLASS="textbf">gnuplot</SPAN> offer?</A>
</H2>
<P>
<UL>
<LI>Plotting two-dimensional functions and data points in many
different styles (points, lines, error bars)
</LI>
<LI>Plotting three-dimensional data points and surfaces in
many different styles (contour plot, mesh)
</LI>
<LI>Algebraic computation in integer, float and complex arithmetic
</LI>
<LI>User-defined functions and hot-keys
</LI>
<LI>Support for a large number of operating systems, graphics
file formats and output devices
</LI>
<LI>Extensive on-line help
</LI>
<LI><SPAN CLASS="logo-TeX">T<SMALL>E</SMALL>X</SPAN>-like text formatting for labels, titles, axes, data points
</LI>
<LI>Interactive command line editing and history (most platforms)
</LI>
</UL>
<P>
<H2><A NAME="SECTION00034000000000000000">
<SPAN CLASS="arabic">1</SPAN>.<SPAN CLASS="arabic">4</SPAN> Is <SPAN CLASS="textbf">gnuplot</SPAN> suitable for scripting?</A>
</H2>
<P>
Yes. Gnuplot can read in files containing additional commands during
an interactive session, or it can be run in batch mode by piping a
pre-existing file or a stream of commands to stdin. Gnuplot is used
as a back-end graphics driver by such higher-level mathematical
packages as Octave, and can easily be wrapped in a cgi script for
use as a web-driven plot generator.
<P>
<H2><A NAME="SECTION00035000000000000000">
<SPAN CLASS="arabic">1</SPAN>.<SPAN CLASS="arabic">5</SPAN> Can I run <SPAN CLASS="textbf">gnuplot</SPAN> on my computer?</A>
</H2>
<P>
<SPAN CLASS="textbf">Gnuplot</SPAN> is in widespread use on many platforms, including
MS Windows, linux, unix, and OSX. The current source code retains
supports for older systems as well, including VMS, Ultrix, OS/2,
MS-DOS, Amiga, OS-9/68k, BeOS, and Macintosh.
Versions since 4.0 have not been extensively tested on legacy platforms.
<P>
Please notify the FAQ-maintainer of any further ports you
might be aware of.
<P>
You should be able to compile the <SPAN CLASS="textbf">gnuplot</SPAN> source more or
less out of the box on any reasonable standard (ANSI/ISO C, POSIX)
environment.
<P>
<H2><A NAME="SECTION00036000000000000000">
<SPAN CLASS="arabic">1</SPAN>.<SPAN CLASS="arabic">6</SPAN> Legalities</A>
</H2>
<P>
<SPAN CLASS="textbf">Gnuplot</SPAN> is freeware authored by a collection of volunteers, who cannot
make any legal statement about the compliance or non-compliance of
<SPAN CLASS="textbf">gnuplot</SPAN> or its uses. There is also no warranty whatsoever. Use at your
own risk.
<P>
Citing from the README of a mathematical subroutine package by R. Freund:
<P>
<BLOCKQUOTE>
For all intent and purpose, any description of what the codes are doing
should be construed as being a note of what we thought the codes did on
our machine on a particular Tuesday of last year. If you're really
lucky, they might do the same for you someday. Then again, do you
really feel *that* lucky?
</BLOCKQUOTE>
<P>
<H2><A NAME="SECTION00037000000000000000">
<SPAN CLASS="arabic">1</SPAN>.<SPAN CLASS="arabic">7</SPAN> Does <SPAN CLASS="textbf">gnuplot</SPAN> have anything to do with the FSF and the GNU
project?</A>
</H2>
<P>
<SPAN CLASS="textbf">Gnuplot</SPAN> is neither written nor maintained by the FSF. It is not
covered by the General Public License, either. It used to be distributed
by the FSF, however, due to licensing issues it is no longer.
<P>
<SPAN CLASS="textbf">Gnuplot</SPAN> is freeware in the sense that you don't have to pay
for it. However it is not freeware in the sense that you would be
allowed to distribute a modified version of your <SPAN CLASS="textbf">gnuplot</SPAN> freely.
Please read and accept the <TT>Copyright</TT> file in your distribution.
<P>
<H2><A NAME="SECTION00038000000000000000">
<SPAN CLASS="arabic">1</SPAN>.<SPAN CLASS="arabic">8</SPAN> Where do I get further information?</A>
</H2>
<P>
See the main gnuplot web page <A NAME="tex2html5"
HREF="http://www.gnuplot.info"><TT>http://www.gnuplot.info</TT></A>
and references therein,
mainly gnuplot links <A NAME="tex2html6"
HREF="http://gnuplot.sourceforge.net/links.html"><TT>http://gnuplot.sourceforge.net/links.html</TT></A>.
<P>
Some documentation and tutorials are available in other languages than English.
See <A NAME="tex2html7"
HREF="http://gnuplot.sourceforge.net/help.html"><TT>http://gnuplot.sourceforge.net/help.html</TT></A>, section "Localized learning pages
about gnuplot", for the most up-to-date list.
<P>
<H1><A NAME="SECTION00040000000000000000">
<SPAN CLASS="arabic">2</SPAN> Setting it up</A>
</H1>
<P>
<H2><A NAME="SECTION00041000000000000000">
<SPAN CLASS="arabic">2</SPAN>.<SPAN CLASS="arabic">1</SPAN> What is the current version of <SPAN CLASS="textbf">gnuplot</SPAN>?</A>
</H2>
<P>
The current released version of <SPAN CLASS="textbf">gnuplot</SPAN> is 4.4 (March 2010).
The current patchlevel is 4.4.0 (March 2010).
<P>
<H2><A NAME="SECTION00042000000000000000"></A>
<A NAME="where-get-gnuplot"></A>
<BR>
<SPAN CLASS="arabic">2</SPAN>.<SPAN CLASS="arabic">2</SPAN> Where can I get <SPAN CLASS="textbf">gnuplot</SPAN>?
</H2>
<P>
The best place to start is <A NAME="tex2html8"
HREF="http://www.gnuplot.info"><TT>http://www.gnuplot.info</TT></A>. From there
you find various pointers to other sites, including the project
development site on SourceForge <A NAME="tex2html9"
HREF="http://sourceforge.net/projects/gnuplot"><TT>http://sourceforge.net/projects/gnuplot</TT></A>.
<P>
The source distribution ("gnuplot-4.4.0.tar.gz" or a similar name) is
available from the official distribution site <A NAME="tex2html10"
HREF="http://sourceforge.net/projects/gnuplot"><TT>http://sourceforge.net/projects/gnuplot</TT></A>.
<P>
Older versions of the <SPAN CLASS="textbf">gnuplot</SPAN> distribution are mirrored
at the Comprehensive TeX Archive Network (CTAN) in the
<TT>graphics/gnuplot</TT> directory. See
<UL>
<LI><A NAME="tex2html11"
HREF="http://www.ctan.org/"><TT>http://www.ctan.org/</TT></A>.
</LI>
</UL>
<P>
<H2><A NAME="SECTION00043000000000000000">
<SPAN CLASS="arabic">2</SPAN>.<SPAN CLASS="arabic">3</SPAN> Where can I get current development version of <SPAN CLASS="textbf">gnuplot</SPAN>?</A>
</H2>
<P>
The development version of gnuplot is availble as a cvs source tree online for
direct browsing from <A NAME="tex2html12"
HREF="http://sourceforge.net/projects/gnuplot"><TT>http://sourceforge.net/projects/gnuplot</TT></A>, section
"CVS". You can download all current sources according to the documentation
therein; for example by a sequence of commands like
<PRE>
cvs -d:pserver:anonymous@gnuplot.cvs.sourceforge.net:/cvsroot/gnuplot login
cvs -z3 -d:pserver:anonymous@gnuplot.cvs.sourceforge.net:/cvsroot/gnuplot co -P gnuplot
</PRE>
or (in bash)
<PRE>
export CVSROOT=:pserver:anonymous@gnuplot.cvs.sourceforge.net:/cvsroot/gnuplot
cvs login
cvs -z3 checkout gnuplot
</PRE>
<P>
Hit <code><return></code> when asked for a password.
<P>
Further, before the <TT>./configure</TT> command of gnuplot compilation phase,
you have to execute <TT>./prepare</TT> to create the up-to-date configure files.
<P>
There are no official preliminary binary releases of gnuplot: you have to
compile it yourself. However, you may find unofficial binary releases for some
platforms, like OS/2, Windows or Macintosh.
<P>
Important note: questions related to the development version should go to
<A NAME="tex2html13"
HREF="mailto:gnuplot-beta@lists.sourceforge.net"><TT>gnuplot-beta@lists.sourceforge.net</TT></A>.
<P>
<H2><A NAME="SECTION00044000000000000000">
<SPAN CLASS="arabic">2</SPAN>.<SPAN CLASS="arabic">4</SPAN> How do I get <SPAN CLASS="textbf">gnuplot</SPAN> to compile on my system?</A>
</H2>
<P>
As you would any other installation. Read the files <TT>README.1ST</TT>
and <TT>README</TT>.
<P>
<UL>
<LI>For Unix, use <TT>./configure</TT> (or <TT>./configure -prefix=$HOME/usr</TT>
for an installation for a single user), <TT>make</TT> and finally
<TT>make install</TT> or <TT>make install-strip</TT>, the latter for smaller
executables without debugging information. If you want to make a RPM package,
then replace the latest step by <TT>checkinstall</TT> or <TT>checkinstall
make install-strip</TT>, supposing the package <TT>checkinstall</TT> on your
machine.
</LI>
<LI>For DOS, if you are using bash and DJGPP, you can just run <TT>djconfig.sh</TT>.
</LI>
<LI>For other platforms, copy the relevant makefile (e.g. <TT>makefile.os2</TT> for
OS/2, or <TT>makefile.mgw</TT> or <TT>makefile.cyg</TT> for Windows) from
<TT>config/</TT> to <TT>src/</TT>, optionally update options in the makefile's
header, then change directory to <TT>src</TT> and run <TT>make</TT>.
</LI>
</UL>
<P>
<H2><A NAME="SECTION00045000000000000000">
<SPAN CLASS="arabic">2</SPAN>.<SPAN CLASS="arabic">5</SPAN> What documentation is there, and how do I get it?</A>
</H2>
<P>
The documentation is included in the source distribution. Look
at the docs subdirectory, where you'll find
<P>
<UL>
<LI>a PDF version of the user manual
</LI>
<LI>a Unix man page, which says how to start <SPAN CLASS="textbf">gnuplot</SPAN>
</LI>
<LI>a help file, which also can be printed as a manual
</LI>
<LI>a tutorial on using <SPAN CLASS="textbf">gnuplot</SPAN> with <SPAN CLASS="logo,LaTeX">L<SUP><SMALL>A</SMALL></SUP>T<SMALL>E</SMALL>X</SPAN>
</LI>
<LI>a quick reference summary sheet for <SPAN CLASS="logo-TeX">T<SMALL>E</SMALL>X</SPAN> only
</LI>
</UL>
<P>
The documentation is built during installation if you have <SPAN CLASS="logo,LaTeX">L<SUP><SMALL>A</SMALL></SUP>T<SMALL>E</SMALL>X</SPAN>
installed on your system, look in the
directories <TT>docs</TT> and <TT>tutorial</TT>.
<TT>make pdf</TT> in the docs subdirectory
will make a <TT>gnuplot.pdf</TT> hypertext file ready for browsing or printing.
<P>
Online gnuplot documentation is available at
<A NAME="tex2html14"
HREF="http://gnuplot.sourceforge.net/documentation.html"><TT>http://gnuplot.sourceforge.net/documentation.html</TT></A>.
<P>
<H2><A NAME="SECTION00046000000000000000">
<SPAN CLASS="arabic">2</SPAN>.<SPAN CLASS="arabic">6</SPAN> Worked examples</A>
</H2>
<P>
There is a directory of worked examples in the the source distribution.
These examples, and the resulting plots, may also be found at
<A NAME="tex2html15"
HREF="http://gnuplot.sourceforge.net/demo/"><TT>http://gnuplot.sourceforge.net/demo/</TT></A>.
<P>
<H2><A NAME="SECTION00047000000000000000">
<SPAN CLASS="arabic">2</SPAN>.<SPAN CLASS="arabic">7</SPAN> How do I modify <SPAN CLASS="textbf">gnuplot</SPAN>, and apply 'patches'?</A>
</H2>
<P>
For this, you will need to recompile <SPAN CLASS="textbf">gnuplot</SPAN>.
<P>
Modifications people make are either done by replacing files,
such as terminal drivers, or by 'patching'. If a file is a
replacement, it will probably tell you in its README or in the
lines at the beginning.
<P>
To patch a file, you need the <TT>patch</TT> utility, and possibly
also <TT>automake</TT> and <TT>autoconf</TT>. On many UNIX systems
these will already be installed; If they aren't, you can find
them wherever GNU software is archived. Typical command for applying a patch
is <code>patch -p0 <newfunctionality.diff</code>.
<P>
There is repository of contributed patches in the "Patches" section on gnuplot's
sourceforge site <A NAME="tex2html16"
HREF="http://gnuplot.sourceforge.net"><TT>http://gnuplot.sourceforge.net</TT></A>.
<P>
<H1><A NAME="SECTION00050000000000000000">
<SPAN CLASS="arabic">3</SPAN> Working with it.</A>
</H1>
<P>
<H2><A NAME="SECTION00051000000000000000">
<SPAN CLASS="arabic">3</SPAN>.<SPAN CLASS="arabic">1</SPAN> How do I get help?</A>
</H2>
<P>
Read this document.
<P>
Give the <code>help</code> command at the initial prompt. After that, keep
looking through the keywords. Good starting points are <code>plot</code>
and <code>set</code>.
<P>
Read the manual, if you have it.
<P>
Look through the demo subdirectory; it should give you some ideas.
<P>
Ask your colleagues, the system administrator or the person who
set up <SPAN CLASS="textbf">gnuplot</SPAN>.
<P>
If all these fail, please upgrade to the newest version of <SPAN CLASS="textbf">gnuplot</SPAN>
or urge your system-administrator to do so. Then
post a question to ~<A NAME="tex2html17"
HREF="news:comp.graphics.apps.gnuplot"><TT>comp.graphics.apps.gnuplot</TT></A>
or send mail
to the gatewayed mailing list <A NAME="tex2html18"
HREF="mailto:gnuplot-info@lists.sourceforge.net"><TT>gnuplot-info@lists.sourceforge.net</TT></A>.
Do not forget to cite the version number and the operating system.
If you want to subscribe to the mailing list, visit the URL
<A NAME="tex2html19"
HREF="http://lists.sourceforge.net/lists/listinfo/gnuplot-info"><TT>http://lists.sourceforge.net/lists/listinfo/gnuplot-info</TT></A>.
But please don't use the mailing list if you can read
~<A NAME="tex2html20"
HREF="news:comp.graphics.apps.gnuplot"><TT>comp.graphics.apps.gnuplot</TT></A>
directly. If you post a
question there, it is considered good form to solicit e-mail
replies and post a summary.
<P>
<H2><A NAME="SECTION00052000000000000000">
<SPAN CLASS="arabic">3</SPAN>.<SPAN CLASS="arabic">2</SPAN> How do I print out my graphs?</A>
</H2>
<P>
The kind of output produced is determined by the <code>set terminal</code>
command; for example, <code>set terminal postscript</code> will produce
the graph in PostScript format. Output can be redirected using
the <code>set output</code> command.
<P>
As an example, the following prints out a graph of sin(x) on a
Unix machine running the X-Window System.
<P>
<PRE>
gnuplot> plot [-6:6] sin(x)
gnuplot> set terminal postscript
Terminal type set to 'postscript'
Options are 'landscape monochrome "Courier" 14'
gnuplot> set output "sin.ps"
gnuplot> replot
gnuplot> set output # set output back to default
gnuplot> set terminal x11 # ditto for terminal type
gnuplot> ! lp -ops sin.ps # print PS File (site dependent)
request id is lprint-3433 (standard input)
lp: printed file sin.ps on fg20.rz.uni-karlsruhe.de (5068 Byte)
!
gnuplot>
</PRE>
<P>
Using the platform-independent way of restoring terminal by <TT>set term
push/pop</TT> commands, do it by
<PRE>
gnuplot> set terminal postscript eps color lw 15 "Helvetica" 20
gnuplot> set out 'a.eps'
gnuplot> replot
gnuplot> set term pop
</PRE>
The command <TT>set term pop</TT> without a previous corresponding <TT>set
term push</TT> switches the terminal back to the startup terminal, e.g. x11, pm or
win.
<P>
In MS Windows you can click in the upper left
corner of the graph window and print directly from there.
<P>
<H2><A NAME="SECTION00053000000000000000">
<SPAN CLASS="arabic">3</SPAN>.<SPAN CLASS="arabic">3</SPAN> How do I include my graphs in <word processor>?</A>
</H2>
<P>
Basically, you save your plot to a file in a format your word
processor can understand (using <code>set term</code> and <code>set output</code>,
see above), and then you read in the plot from your word processor. Vector
formats (PostScript, emf, svg, pdf, <SPAN CLASS="logo-TeX">T<SMALL>E</SMALL>X</SPAN>, <SPAN CLASS="logo,LaTeX">L<SUP><SMALL>A</SMALL></SUP>T<SMALL>E</SMALL>X</SPAN>, etc) should be preferred,
as you can scale your graph later to the right size.
<P>
Details depend on which word processor you use; use <code>set term</code> to get a
list of available file formats.
<P>
Many word processors can use Encapsulated PostScript for graphs.
This can be generated by the
<code>set terminal postscript eps [color]</code>
command.
Note that it is a good idea to check and correct the bounding box of the
graphs in the eps files (manually or by the fixbb script from gnuplot
webpage), as you have to correct this box for any eps figure produced by
whichever program.
Some (most?) word processors do not preview the actual image in the eps
file, and you have to add the preview image yourself. You can use the GSView
viewer for this (available for OS/2, Windows and X11), or some Unix ps
tool. Note that the preview image increases size of the eps file; the
smallest increase you may get by choosing Tiff 6 Packbits.
<P>
Some office Windows applications, also OpenOffice.org,
can handle vector images produces by the emf terminal.
OpenOffice.org can also read AutoCAD's dxf format, as well as SVG
thanks to SVG Import Filter
<A NAME="tex2html21"
HREF="http://www.ipd.uni-karlsruhe.de/~hauma/svg-import/"><TT>http://www.ipd.uni-karlsruhe.de/ hauma/svg-import/</TT></A>.
<P>
With <SPAN CLASS="logo-TeX">T<SMALL>E</SMALL>X</SPAN>, it depends on what you use to print your dvi files.
If you use dvips or dvi2ps, you can use Encapsulated PostScript. For emTeX
(popular for OS/2 and MS-DOS), you can use emTeX, otherwise use the <SPAN CLASS="logo,LaTeX">L<SUP><SMALL>A</SMALL></SUP>T<SMALL>E</SMALL>X</SPAN>
terminal type, which generates a picture environment. You can also use epslatex
to separate the graphics and text parts. Other possibilities include pslatex or
pstex terminals, and metafont or metapost terminals.
<P>
With <SPAN CLASS="logo-TeX">T<SMALL>E</SMALL>X</SPAN> processed by pdftex or pdflatex, you can use png, jpeg and pdf
terminal types. You can also use the postscript eps terminal and convert the eps
file externally to pdf by <code>epstopdf</code>. Another choice is the epslatex
terminal, after converting the eps part to pdf as above (the <SPAN CLASS="logo-TeX">T<SMALL>E</SMALL>X</SPAN> part can
remain unchanged).
<P>
Most word processors can import bitmap images (png, pbm, etc).
The disadvantage of this approach is that the resolution of your
plot is limited by the size of the plot at the time it is generated
by gnuplot, which is generally a much lower resolution than the
document will eventually be printed in.
<P>
Under IBM OS/2, MacOS and Micro$oft Windows you can use the clipboard to
copy your graph and paste it into your favourite word processor.
<P>
The mif terminal type produces output for FrameMaker.
<P>
<H2><A NAME="SECTION00054000000000000000">
<SPAN CLASS="arabic">3</SPAN>.<SPAN CLASS="arabic">4</SPAN> How do I edit or post-process a <SPAN CLASS="textbf">gnuplot</SPAN> graph?</A>
</H2>
<P>
This depends on the terminal type you use.
<P>
<UL>
<LI>X11 toolkits: You can use the terminal type fig
and use the <SPAN CLASS="textbf">xfig</SPAN> drawing program to edit the
plot afterwards. You can obtain the xfig program from its web site
<A NAME="tex2html22"
HREF="http://www.xfig.org"><TT>http://www.xfig.org</TT></A>. More information about the text-format used
for fig can be found in the fig-package.
<P>
You may use the tgif terminal, which creates output suitable for
reading within <TT>tgif</TT> (<A NAME="tex2html23"
HREF="http://bourbon.cs.umd.edu:8001/tgif/"><TT>http://bourbon.cs.umd.edu:8001/tgif/</TT></A>),
an interactive 2-D drawing tool under X11.
<P>
</LI>
<LI>You may use the svg terminal (scalable vector graphics), which can
be further edited by a svg editor, e.g.
<SPAN CLASS="textbf">Inkscape</SPAN> (<A NAME="tex2html24"
HREF="http://www.inkscape.org"><TT>http://www.inkscape.org</TT></A>),
<SPAN CLASS="textbf">Sketch</SPAN> (<A NAME="tex2html25"
HREF="http://sketch.sourceforge.net"><TT>http://sketch.sourceforge.net</TT></A>) or
<SPAN CLASS="textbf">Dia</SPAN> (<A NAME="tex2html26"
HREF="http://www.lysator.liu.se/~alla/dia"><TT>http://www.lysator.liu.se/ alla/dia</TT></A>), or loaded
into <SPAN CLASS="textbf">OpenOffice.org</SPAN> with an on-fly conversion into OO.o Draw
primitives.
<P>
</LI>
<LI>PostScript or PDF output can be edited directly by tools such
as Adobe Illustrator or Acrobat, or can be converted to a variety
of other editable vector formats by the <SPAN CLASS="textbf">pstoedit</SPAN> package.
Pstoedit is available at <A NAME="tex2html27"
HREF="http://www.pstoedit.net"><TT>http://www.pstoedit.net</TT></A>.
<P>
</LI>
<LI>The mif terminal type produces an editable FrameMaker document.
<P>
</LI>
<LI>The DXF format is the AutoCAD's format, editable by several
other applications.
<P>
</LI>
<LI>Bitmapped graphics (e.g. png, jpeg, pbm) can be edited using
tools such as ImageMagick or Gimp.
In general, you should use a vector graphics program to post-process
vector graphic formats, and a pixel-based editing program
to post-process pixel graphics.
<P>
</LI>
</UL>
<P>
<H2><A NAME="SECTION00055000000000000000">
<SPAN CLASS="arabic">3</SPAN>.<SPAN CLASS="arabic">5</SPAN> How do I change symbol size, line thickness and the like?</A>
</H2>
<P>
Gnuplot offers a variety of commands to set line and point properties,
including color, thickness, point shape, etc. The command <code>test</code> will
display a test page for the currently selected terminal type showing
the available pre-defined combinations of color, size, shape, etc.
The <code>set style</code> command can be used to define additional combinations.
<P>
<H2><A NAME="SECTION00056000000000000000">
<SPAN CLASS="arabic">3</SPAN>.<SPAN CLASS="arabic">6</SPAN> Can I animate my graphs?</A>
</H2>
<P>
First have a look at animate.dem in the demo directory
of <SPAN CLASS="textbf">gnuplot</SPAN>. Basically, animated graphs are a sequence of
plots in a suitable format.
<P>
If your installation of <SPAN CLASS="textbf">gnuplot</SPAN> is linked with gd 2.0.29 or newer (see
previous entry), the gif terminal can generate directly an animated GIF.
<P>
Otherwise, have a look at the tool whirlgif 3.04, available at
<A NAME="tex2html28"
HREF="http://www.danbbs.dk/~dino/whirlgif"><TT>http://www.danbbs.dk/ dino/whirlgif</TT></A>. It reads run-length
encoded GIF files and packs them into a minimal animation.
On the web-pages you will find a manual and an example.
<P>
You can also write a small script to get <SPAN CLASS="textbf">gnuplot</SPAN> to output a family
of GIF files, then have it execute some animator such as gifsicle:
<A NAME="tex2html29"
HREF="http://www.lcdf.org/~eddietwo/gifsicle"><TT>http://www.lcdf.org/ eddietwo/gifsicle</TT></A>
or gifmerge
<A NAME="tex2html30"
HREF="http://the-labs.com/GIFMerge"><TT>http://the-labs.com/GIFMerge</TT></A>.
<P>
mpeg_encode will encode a sequence of images into an mpeg format movie.
<P>
<H2><A NAME="SECTION00057000000000000000">
<SPAN CLASS="arabic">3</SPAN>.<SPAN CLASS="arabic">7</SPAN> How do I plot implicit defined graphs?</A>
</H2>
<P>
Implicit graphs or curves cannot be plotted directly in <SPAN CLASS="textbf">gnuplot</SPAN>.
However there is a workaround.
<PRE>
gnuplot> # An example. Place your definition in the following line:
gnuplot> f(x,y) = y - x**2 / tan(y)
gnuplot> set contour base
gnuplot> set cntrparam levels discrete 0.0
gnuplot> unset surface
gnuplot> set table 'curve.dat'
gnuplot> splot f(x,y)
gnuplot> unset table
gnuplot> plot 'curve.dat' w l
</PRE>
The trick is to draw the single contour line z=0 of the surface
z=f(x,y), and store the resulting contour curve to a <SPAN CLASS="textbf">gnuplot</SPAN> datafile.
<P>
<H2><A NAME="SECTION00058000000000000000">
<SPAN CLASS="arabic">3</SPAN>.<SPAN CLASS="arabic">8</SPAN> How to fill an area between two curves</A>
</H2>
<P>
A plot with filled area between two given curves requires a parametric plot with
<code>filledcurves closed</code>.
The example below demonstrates this for two curves f(x) and g(x) with a tricky
"folded" parameter <code>t</code>:
<P>
<PRE>
set parametric
f(x)=cos(x)
g(x)=sin(x)
xmax=pi/4
set xrange [0:xmax]
set trange [0:2*xmax]
path(t) = ( t<= xmax ? f(t) : g(2*xmax-t) )
fold(t) = (t <=xmax ? t : 2*xmax - t)
plot fold(t),path(t) with filledcurves closed
</PRE>
<P>
Note that the above code fills area between the two curves, not area satisfying
inequality g(x)<f(x). If you want the latter, you should use the ternary
operator in <code>path(t)</code> to return an undefined value (0/0) if the inequality
is not satisfied.
<P>
See the documentation for <code>help parametric</code>, <code>help filledcurves</code>, and
<code>help ternary</code>.
<P>
<H2><A NAME="SECTION00059000000000000000"></A>
<A NAME="blank1"></A>
<BR>
<SPAN CLASS="arabic">3</SPAN>.<SPAN CLASS="arabic">9</SPAN> Pm3d splot from a datafile does not draw anything
</H2>
<P>
You do <code>set pm3d; splot 'a.dat'</code> and no plot but colorbox appears.
Obviously, there is no blank line in between two subsequent scans (isolines) in
the data file. Add blank lines! If you are curious what this means, then don't
hesitate to look to files like <code>demo/glass.dat</code> or <code>demo/triangle.dat</code>
in the gnuplot demo directory.
<P>
You can find useful the following awk script (call it e.g. <code>addblanks.awk</code>)
which adds blank lines to a data file whenever number in the first column
changes:
<PRE>
/^[[:blank:]]*#/ {next} # ignore comments (lines starting with #)
NF < 3 {next} # ignore lines which don't have at least 3 columns
$1 != prev {printf "\n"; prev=$1} # print blank line
{print} # print the line
</PRE>
Then, either preprocess your data file by command
<code>awk -f addblanks.awk <a.dat</code> or plot the datafile under a unixish platform
by <code>gnuplot> splot "<awk -f addblanks.awk a.dat"</code>.
<P>
<H2><A NAME="SECTION000510000000000000000">
<SPAN CLASS="arabic">3</SPAN>.<SPAN CLASS="arabic">10</SPAN> Drawing a (color) map, i.e. 2D projection of 3D data</A>
</H2>
<P>
Use <TT>set view map; unset surface</TT> or <TT>set pm3d map</TT> rather than
<TT>set view 180,0</TT>. The latter facilitates drawing matrices or data files
as maps, even without the necessity for matrix-like data organization
(gridding). It is possible to decrease the output postscript file size by
postprocessing it by <TT>pm3dCompress.awk</TT> or
<TT>pm3dConvertToImage.awk</TT>.
<P>
Note there is a new plotting style <code>with image</code> for plotting 2D color
images with support for almost arbitrary text or binary files in "Patches"
section on gnuplot's sourceforge site
<A NAME="tex2html31"
HREF="http://www.sourceforge.net/projects/gnuplot/"><TT>http://www.sourceforge.net/projects/gnuplot/</TT></A>.
<P>
<H2><A NAME="SECTION000511000000000000000">
<SPAN CLASS="arabic">3</SPAN>.<SPAN CLASS="arabic">11</SPAN> How to overlay dots/points scatter plot onto a pm3d map/surface</A>
</H2>
<P>
Use the explicit (see also implicit) switch of the pm3d style:
<PRE>
gnuplot> set pm3d explicit
gnuplot> splot x with pm3d, x*y with points
</PRE>
<P>
<H2><A NAME="SECTION000512000000000000000">
<SPAN CLASS="arabic">3</SPAN>.<SPAN CLASS="arabic">12</SPAN> How to draw black contour plot, and contours with labels</A>
</H2>
<P>
Well, it is very simple even though it is hard to discover: <code>unset clabel</code>.
<PRE>
set contour both; set cntr levels 100
unset clabel
unset surface
splot x*y with line lt -1
pause -1
splot x*y with line palette
</PRE>
<P>
Another solution requires to write contours into a temporary file using the
table terminal:
<PRE>
set contour base; set cntrparam levels 15; unset surface; set view map
splot x*x+y*y; pause -1
set table 'contour.dat'
replot
unset table
</PRE>
Now, for drawing it in 2D, do
<PRE>
reset
plot 'contour.dat' with line -1
</PRE>
and for contours in 3D do
<PRE>
reset
# Change single blank lines to double blank lines
!awk "NF<2{printf\"\n\"}{print}" <contour.dat >contour1.dat
splot 'contour1.dat' with line -1
</PRE>
See also the following question "How to overlay contour plot over pm3d map/surface".
<P>
Labelling contours by their z-value can be achieved by a suitable script
generating automatically the appropriate <code>set label</code> commands; you can find
one at gnuplot scripts page
<A NAME="tex2html32"
HREF="http://gnuplot.sourceforge.net/scripts/index.html#tricks-here"><TT>http://gnuplot.sourceforge.net/scripts/index.html#tricks-here</TT></A>.
<P>
<H2><A NAME="SECTION000513000000000000000">
<SPAN CLASS="arabic">3</SPAN>.<SPAN CLASS="arabic">13</SPAN> How to overlay contour plot over pm3d map/surface</A>
</H2>
<P>
This requires you to write contours into a temporary file using the table
terminal, and then use this file in the final drawing without set contours.
The following example demonstrates this for a map; for surface, remove
<code>set pm3d map</code> and put <code>set ticslevel 0</code>.
<PRE>
# Write contours of function x*x-y*y to a (temporary) file
set contour base; set cntrparam level 20
unset surface
set table 'contour.dat'
splot x*x-y*y
unset table
# Change single blank lines to double blank lines
!awk "NF<2{printf\"\n\"}{print}" <contour.dat >contour1.dat
# Draw the plot
reset
set palette gray
set palette gamma 2.5
set pm3d map
set pm3d explicit
splot x*x+y*y with pm3d, 'contour1.dat' with line lt -1
!rm contour.dat contour1.dat
</PRE>
The last command deletes the two temporary files.
<P>
<H2><A NAME="SECTION000514000000000000000">
<SPAN CLASS="arabic">3</SPAN>.<SPAN CLASS="arabic">14</SPAN> Color facets with pm3d</A>
</H2>
<P>
It is possible to draw colors facets of a 3D objects, organized in such a file:
<PRE>
# triangle 1
x0 y0 z0 <c0>
x1 y1 z1 <c1>
x2 y2 z2 <c2>
x2 y2 z2 <c2>
# triangle 2
x y z
...
</PRE>
<P>
Notice the positioning single and double blank line. <TT><c></TT> is an optional
color.
<P>
Then plot it by (either of splot's):
<PRE>
set pm3d
set style data pm3d
splot 'facets.dat'
splot 'facets_with_color.dat' using 1:2:3:4
</PRE>
<P>
Note that you avoid surface lines by <TT>set style data pm3d</TT> or
<TT>splot ... with pm3d</TT>.
<P>
In the above example, pm3d displays triangles as independent surfaces.
They are plotted one surface after another, as found in the data file.
Parts overlapping in 2D projection are overdrawn.
<P>
Gnuplot is not 3D modeling program. Its hidden routines apply for points and
lines, but not for faces.
Without handling the data as a collection of faces, there would be no surface
anything could be hidden behind. The 'hidden3d' algorithm works by using the
input data in two ways: first, to set up a collection of triangles (made from a
mesh of quadrangles) that form the surface, second as a collection of edges. It
then goes through all those edges, checking what parts of them are not hidden
behind any faces, and draws those.
<P>
Consequently, gnuplot won't draw your surface or 3D object as a virtual reality.
It works OK for <TT>set pm3d map</TT> but for true 3D you would be probably more
happy writing a convertor of your facets into a VRML file.
<P>
<H2><A NAME="SECTION000515000000000000000">
<SPAN CLASS="arabic">3</SPAN>.<SPAN CLASS="arabic">15</SPAN> Palette for printing my color map on color as well as black&white
printer?</A>
</H2>
<P>
I think it is this one, for example: <TT>set palette rgbformulae -25,-24,-32</TT>.
Can somebody prove this?
<P>
<H1><A NAME="SECTION00060000000000000000">
<SPAN CLASS="arabic">4</SPAN> Wanted features</A>
</H1>
<P>
<H2><A NAME="SECTION00061000000000000000">
<SPAN CLASS="arabic">4</SPAN>.<SPAN CLASS="arabic">1</SPAN> What's new in <SPAN CLASS="textbf">gnuplot</SPAN> 4.2, 4.4 etc?</A>
</H2>
<P>
Too many things to be named here.
Please refer to the <TT>NEWS</TT> file in the source distribution, or the
"New features" section in the gnuplot documentation.
<P>
<H2><A NAME="SECTION00062000000000000000">
<SPAN CLASS="arabic">4</SPAN>.<SPAN CLASS="arabic">2</SPAN> Does <SPAN CLASS="textbf">gnuplot</SPAN> support a driver for <graphics format>?</A>
</H2>
<P>
To see a list of the available graphic drivers for your installation of
<SPAN CLASS="textbf">gnuplot</SPAN>, type <code>set term</code>.
<P>
Some graphics drivers are included in the normal distribution,
but are not built by default. If you want to use them, you'll
have to change file <code>gnuplot/src/term.h</code>, and recompile.
<P>
<H2><A NAME="SECTION00063000000000000000">
<SPAN CLASS="arabic">4</SPAN>.<SPAN CLASS="arabic">3</SPAN> Does <SPAN CLASS="textbf">gnuplot</SPAN> have hidden line removal?</A>
</H2>
<P>
Yes.
<P>
<H2><A NAME="SECTION00064000000000000000">
<SPAN CLASS="arabic">4</SPAN>.<SPAN CLASS="arabic">4</SPAN> Does <SPAN CLASS="textbf">gnuplot</SPAN> support bar-charts/histograms/boxes?</A>
</H2>
<P>
Various clustered and stacked histogram styles are supported in <SPAN CLASS="textbf">gnuplot</SPAN>
version 4.2 and later as separate style types.
<P>
<H2><A NAME="SECTION00065000000000000000">
<SPAN CLASS="arabic">4</SPAN>.<SPAN CLASS="arabic">5</SPAN> Does <SPAN CLASS="textbf">gnuplot</SPAN> support pie charts?</A>
</H2>
<P>
It's not possible in <SPAN CLASS="textbf">gnuplot</SPAN>, but have a look at
<A NAME="tex2html33"
HREF="http://www.usf.uni-osnabrueck.de/~breiter/tools/piechart/piecharts.en.html"><TT>http://www.usf.uni-osnabrueck.de/ breiter/tools/piechart/piecharts.en.html</TT></A>
<P>
<H2><A NAME="SECTION00066000000000000000">
<SPAN CLASS="arabic">4</SPAN>.<SPAN CLASS="arabic">6</SPAN> Does <SPAN CLASS="textbf">gnuplot</SPAN> quarterly time charts?</A>
</H2>
<P>
It's not possible in <SPAN CLASS="textbf">gnuplot</SPAN>, but have a look at
<A NAME="tex2html34"
HREF="http://ricardo.ecn.wfu.edu/~cottrell/qplot"><TT>http://ricardo.ecn.wfu.edu/ cottrell/qplot</TT></A>. The corresponding
file <code>qplot.zip</code> can be obtained from the contrib directory
on any <SPAN CLASS="textbf">gnuplot</SPAN> server.
<P>
<H2><A NAME="SECTION00067000000000000000">
<SPAN CLASS="arabic">4</SPAN>.<SPAN CLASS="arabic">7</SPAN> Can I put multiple pages on one page?</A>
</H2>
<P>
Yes. <code>set multiplot</code>.
<P>
If you use the postscript terminal and plot one graph per page you can
use the program mpage (<A NAME="tex2html35"
HREF="http://www.mesa.nl/pub/mpage"><TT>http://www.mesa.nl/pub/mpage</TT></A>) to print
multiple logical pages per physical page. A similar program is
the psnup program in the psutils package. This package is available at
any CTAN mirror.
<P>
<H2><A NAME="SECTION00068000000000000000">
<SPAN CLASS="arabic">4</SPAN>.<SPAN CLASS="arabic">8</SPAN> Does <SPAN CLASS="textbf">gnuplot</SPAN> support multiple y-axes on a single plot?</A>
</H2>
<P>
Yes. You can have 2 x- and 2 y-axes per plot. The additional axes are called
x2 and y2. See <code>help plot</code>.
<P>
<H2><A NAME="SECTION00069000000000000000">
<SPAN CLASS="arabic">4</SPAN>.<SPAN CLASS="arabic">9</SPAN> Can I put both commands and data into a single file?</A>
</H2>
<P>
This is possible by the new <code>plot "-"</code> possibility. The
<code>plot "-"</code> command allows to read the data to be plot from
standard input or the current batch job.
<P>
<PRE>
gnuplot> plot "-"
1 1
2 4
3 9
e
</PRE>
<P>
<H2><A NAME="SECTION000610000000000000000">
<SPAN CLASS="arabic">4</SPAN>.<SPAN CLASS="arabic">10</SPAN> Can I put Greek letters and super/subscripts into my labels?</A>
</H2>
<P>
Most terminal types (output device drivers) support an "enhanced text" mode.
This lets you use sub- and superscripts. It also allows to use Greek
letters and math symbols to the extent that these are supported by the fonts
installed on your system.
<P>
You might try using the <SPAN CLASS="logo,LaTeX">L<SUP><SMALL>A</SMALL></SUP>T<SMALL>E</SMALL>X</SPAN> terminal type and putting text
like <code>"\\alpha_{3}"</code> or <code>'\alpha_{3}'</code> .
If you include your <SPAN CLASS="textbf">gnuplot</SPAN>-graphs into a <SPAN CLASS="logo,LaTeX">L<SUP><SMALL>A</SMALL></SUP>T<SMALL>E</SMALL>X</SPAN> document
you can use the <SPAN CLASS="logo,LaTeX">L<SUP><SMALL>A</SMALL></SUP>T<SMALL>E</SMALL>X</SPAN>-package psfrag to typeset any characters
into your graphs.
<P>
One more possibility is to use the MetaPost terminal. It supports <SPAN CLASS="logo-TeX">T<SMALL>E</SMALL>X</SPAN>
syntax and is converted onto encapsulated PostScript by mpost.
<P>
<H2><A NAME="SECTION000611000000000000000">
<SPAN CLASS="arabic">4</SPAN>.<SPAN CLASS="arabic">11</SPAN> How do I include accented characters</A>
</H2>
<P>
To obtain accented characters like ü or n in your labels you should use
8bit character codes together with the appropriate encoding option.
See the following example:
<P>
<PRE>
gnuplot> set encoding iso_8859_1
gnuplot> set title "M\374nchner Bierverbrauch \374ber die Jahre"
gnuplot> plot "bier.dat" u 1:2
</PRE>
<P>
Consequently, you can type labels in Czech, French, Hungarian, Russian... by
means of an appropriate <TT>set encoding</TT>. However, you cannot mix two
encodings in one file (e.g. accents for west and east latin encodings).
<P>
A more general solution is to use UTF-8 encoded fonts, and type the
UTF-8 characters directly into gnuplot. This works for many terminal types
but not, unfortunately, PostScript. Update: Version 4.4 contains
contains more complete support for UTF-8, including PostScript.
<P>
<H2><A NAME="SECTION000612000000000000000">
<SPAN CLASS="arabic">4</SPAN>.<SPAN CLASS="arabic">12</SPAN> Can I do 1:1 scaling of axes?</A>
</H2>
<P>
Use <code>set size square</code>.
<P>
<H2><A NAME="SECTION000613000000000000000">
<SPAN CLASS="arabic">4</SPAN>.<SPAN CLASS="arabic">13</SPAN> Can I put different text sizes into my plots?</A>
</H2>
<P>
Some terminals can, others can't. Some allow you to choose a font size for the
entire plot. Terminals supporting the "enhanced text" mode
allow you to change fonts and text sizes within a plot. Look at
the help for these terminals.
<P>
<H2><A NAME="SECTION000614000000000000000">
<SPAN CLASS="arabic">4</SPAN>.<SPAN CLASS="arabic">14</SPAN> How do I skip data points?</A>
</H2>
<P>
By specifying <TT>?</TT> as a data value, as in
<PRE>
1 2
2 3
3 ?
4 5
</PRE>
<P>
See also <TT>set missing</TT>.
See also <TT>set datafile commentschars</TT> for specifying comment characters in
data files.
<P>
<H2><A NAME="SECTION000615000000000000000">
<SPAN CLASS="arabic">4</SPAN>.<SPAN CLASS="arabic">15</SPAN> How do I plot every nth point?</A>
</H2>
<P>
This can be specified with various options for the command <code>plot</code>,
for example <code>plot 'a.dat' every 2</code>.
<P>
<H2><A NAME="SECTION000616000000000000000">
<SPAN CLASS="arabic">4</SPAN>.<SPAN CLASS="arabic">16</SPAN> How do I plot a vertical line?</A>
</H2>
<P>
Depending on context, the main methods are:
<UL>
<LI><code>set arrow .... .... nohead</code> where you have to compute
explicitly the start and the end of the arrow.
</LI>
<LI>generate (inlined) datapoints and plot them
</LI>
<LI>switch to parametric mode
</LI>
</UL>
<P>
<H2><A NAME="SECTION000617000000000000000">
<SPAN CLASS="arabic">4</SPAN>.<SPAN CLASS="arabic">17</SPAN> How do I plot data files</A>
</H2>
<P>
Easily: by a command <TT>plot 'a.dat'</TT>. In 3D, use <TT>splot 'a.dat'</TT> -
but don't forget to put a blank line in between two subsequent scans (isolines),
otherwise you will get an error that the data is not gridded; see also question
<A HREF="#blank1">3.9</A>. If your data are not gridded, then use <TT>set dgrid3d {many
options}</TT>.
<P>
<H2><A NAME="SECTION000618000000000000000">
<SPAN CLASS="arabic">4</SPAN>.<SPAN CLASS="arabic">18</SPAN> How do I replot multiplot drawing</A>
</H2>
<P>
You cannot directly: gnuplot supports <code>replot</code> command, not
<code>remultiplot</code>. You have to write the complete sequence of commands since
<code>set multiplot</code> till <code>unset multiplot</code> into a script file. Then
you can <code>load</code> the script into gnuplot as many times as you need for
replotting the drawing to different terminals or output files.
<P>
<H1><A NAME="SECTION00070000000000000000">
<SPAN CLASS="arabic">5</SPAN> Miscellaneous</A>
</H1>
<P>
<H2><A NAME="SECTION00071000000000000000">
<SPAN CLASS="arabic">5</SPAN>.<SPAN CLASS="arabic">1</SPAN> I've found a bug, what do I do?</A>
</H2>
<P>
First, try to see whether it actually is a bug, or whether it
is a feature which may be turned off by some obscure set-command.
<P>
Next, see whether you have an old version of <SPAN CLASS="textbf">gnuplot</SPAN>; if you do,
chances are the bug has been fixed in a newer release.
<P>
Fixes for bugs reported since the release of the current version are
held in the <TT>patches</TT> directory at <SPAN CLASS="textbf">gnuplot</SPAN> distribution sites.
Before submitting a bug report, please check whether the bug in question
has already been fixed.
<P>
If, after checking these things, you still are convinced that there is a
bug, proceed as follows. If you have a fairly general sort of bug
report, posting to ~<A NAME="tex2html36"
HREF="news:comp.graphics.apps.gnuplot"><TT>comp.graphics.apps.gnuplot</TT></A>
is probably
the way to go. If you have investigated a problem in detail, especially
if you have a context or unified diff that fixes the problem, please
e-email a report to <A NAME="tex2html37"
HREF="mailto:gnuplot-bug@lists.sourceforge.net"><TT>gnuplot-bug@lists.sourceforge.net</TT></A>.
<P>
The bug-gnuplot list is for reporting and collecting bug fixes, the
~<A NAME="tex2html38"
HREF="news:comp.graphics.apps.gnuplot"><TT>comp.graphics.apps.gnuplot</TT></A>
newsgroup will be more help for
finding work arounds or actually solving <SPAN CLASS="textbf">gnuplot</SPAN> related problems. If
you do send in a bug report, be sure and include the version of <SPAN CLASS="textbf">gnuplot</SPAN>
(including patchlevel) as shown by the command <code>show version long</code>,
terminal driver, operating system, an exact description of the bug and
input which can reproduce the bug. Failure to indicate these details can
render a solution to your problem almost impossible. Also, any context
diffs should be referenced against the latest official version of
<SPAN CLASS="textbf">gnuplot</SPAN> if at all possible.
<P>
<H2><A NAME="SECTION00072000000000000000">
<SPAN CLASS="arabic">5</SPAN>.<SPAN CLASS="arabic">2</SPAN> Can I use <SPAN CLASS="textbf">gnuplot</SPAN> routines for my own programs?</A>
</H2>
<P>
On systems supporting pipes, you can pipe commands to <SPAN CLASS="textbf">gnuplot</SPAN> from other
programs. Many applications with gnuplot as the graphics engine, like Octave
(<A NAME="tex2html39"
HREF="http://www.octave.org"><TT>http://www.octave.org</TT></A>), uses this method. This also works from a cgi script to
drive <SPAN CLASS="textbf">gnuplot</SPAN> from a forms-based web page.
<P>
John Campbell (<A NAME="tex2html40"
HREF="mailto:jdc@nauvax.ucc.nau.edu"><TT>jdc@nauvax.ucc.nau.edu</TT></A>) modified a much earlier
version of <SPAN CLASS="textbf">gnuplot</SPAN> (3.5) to be a library of C subroutines callable
from a C program. Gnuplot itself has changed radically since then,
and we are not aware of any plans to create a similar library based on
the current version.
<P>
<H2><A NAME="SECTION00073000000000000000">
<SPAN CLASS="arabic">5</SPAN>.<SPAN CLASS="arabic">3</SPAN> What extensions have people made to <SPAN CLASS="textbf">gnuplot</SPAN>? Where can I get
them?</A>
</H2>
<P>
Many extensions or patches are available on the "Patches" page of the
gnuplot development site
<A NAME="tex2html41"
HREF="http://sourceforge.net/tracker/?group_id=2055&atid=302055"><TT>http://sourceforge.net/tracker/?group_id=2055&atid=302055</TT></A>.
The current development version will generally include some of these
being debugged for inclusion in a later official release of gnuplot.
<P>
Older extensions, which may or may not work with the current version,
are available from <A NAME="tex2html42"
HREF="ftp://ftp.ucc.ie/pub/gnuplot/contrib/"><TT>ftp.ucc.ie</TT> in <TT>/pub/gnuplot/contrib/</TT></A>.
<P>
Some extensions available:
<UL>
<LI><TT>date-errorbar</TT>: allows dates in the hi/lo fields for
errorbars.
</LI>
<LI><TT>perltk</TT>: A perl/tk canvas widget.
</LI>
<LI><TT>polyg.patch</TT>: Implements a polygon plotting style.
</LI>
<LI><TT>xgfe</TT>: graphical front end using the Qt widgets available at
<A NAME="tex2html43"
HREF="http://www.tug.org/tex-archive/graphics/gnuplot/contrib/"><TT>http://www.tug.org/tex-archive/graphics/gnuplot/contrib/</TT></A>.
</LI>
<LI><TT>Gnuplot.py</TT>: A python package to create graphs from
within python. More information at
<A NAME="tex2html44"
HREF="http://gnuplot-py.sourceforge.net"><TT>http://gnuplot-py.sourceforge.net</TT></A>.
</LI>
</UL>
<P>
<H2><A NAME="SECTION00074000000000000000">
<SPAN CLASS="arabic">5</SPAN>.<SPAN CLASS="arabic">4</SPAN> I need an integration, fft, iir-filter,...!</A>
</H2>
<P>
<SPAN CLASS="textbf">Gnuplot</SPAN> has been and is a plotting program, not a data
processing or mathematical program suite. Therefore <SPAN CLASS="textbf">gnuplot</SPAN>
can't do that. Look into the demo file "bivariat.dem" for a basic
implementation of an integration.
<P>
For more sophisticated data-processing read the next section.
<P>
<H2><A NAME="SECTION00075000000000000000">
<SPAN CLASS="arabic">5</SPAN>.<SPAN CLASS="arabic">5</SPAN> Can I do heavy-duty data processing with <SPAN CLASS="textbf">gnuplot</SPAN>? or
What is beyond <SPAN CLASS="textbf">gnuplot</SPAN>?</A>
</H2>
<P>
<SPAN CLASS="textbf">gnuplot</SPAN> alone is not suited very well for this. One thing you might try
is <TT>fudgit</TT>, an interactive multi-purpose fitting program written by
Martin-D. Lacasse (<TT>isaac@frodo.physics.mcgill.ca</TT>). It can use
<SPAN CLASS="textbf">gnuplot</SPAN> as its graphics back end and is available from
<A NAME="tex2html45"
HREF="ftp://ftp.physics.mcgill.ca/pub/Fudgit/fudgit_2.33.tar.Z"><TT>ftp.physics.mcgill.ca</TT> in <TT>/pub/Fudgit/fudgit_2.33.tar.Z</TT></A>
and from
the main Linux server, tsx-11.mit.edu and its numerous mirrors around
the world as <TT>/pub/linux/sources/usr.bin/fudgit-2.33.tar.z</TT>.
Versions are available for AIX, Data General, HP-UX, IRIX 4, Linux,
NeXT, Sun3, Sun4, Ultrix, OS/2 and MS-DOS. The MS-DOS version is
available on simtel20 mirrors (simtel20 itself has closed down) in the
"math" subdirectory as <code>fudg_231.zip</code>.
<P>
Michael Courtney has written a program called lsqrft, which uses the
Levenberg-Marquardt - algorithm for fitting data to a function. It is
available from
<A NAME="tex2html46"
HREF="ftp://hobbes.nmsu.edu/pub/os2/apps/analysis/lsqrft15.zip"><TT>hobbes.nmsu.edu</TT> in <TT>/pub/os2/apps/analysis/lsqrft15.zip</TT></A>;
sources, which should compile on Unix, and executables for MS-DOS and
OS/2 are available. There is an interface to the OS/2 presentation
manager.
<P>
You might also want to look at the applications developed by
the Software Tools Group (STG) at the National Center for
Supercomputing Applications. Ftp to ftp.ncsa.uiuc.edu
and get the file README.BROCHURE for more information.
<P>
You can also try pgperl, an integration of the PGPLOT plotting
package with Perl 5. Information can be found at
<A NAME="tex2html47"
HREF="http://www.ast.cam.ac.uk/AAO/local/www/kgb/pgperl"><TT>http://www.ast.cam.ac.uk/AAO/local/www/kgb/pgperl</TT></A>, the source is
available from <A NAME="tex2html48"
HREF="ftp://ftp.ast.cam.ac.uk/pub/kgb/pgperl/"><TT>ftp.ast.cam.ac.uk</TT> in <TT>/pub/kgb/pgperl/</TT></A>
or
<A NAME="tex2html49"
HREF="ftp://linux.nrao.edu/pub/packages/pgperl/"><TT>linux.nrao.edu</TT> in <TT>/pub/packages/pgperl/</TT></A>.
<P>
Another possibility is <SPAN CLASS="textbf">Octave</SPAN>. To quote from its README: Octave is a
high-level language, primarily intended for numerical computations. Octave is
licensed under GPL, and in principle, it is a free Matlab clone. It provides a
convenient command line interface for solving linear and nonlinear problems
numerically. The latest released version of Octave is always available from
<A NAME="tex2html50"
HREF="http://www.octave.org"><TT>http://www.octave.org</TT></A>. By the way, octave uses <SPAN CLASS="textbf">gnuplot</SPAN> as its plotting
engine, so you get a data-processing program on top of <SPAN CLASS="textbf">gnuplot</SPAN>.
<P>
Finally, there is <TT>scilab</TT> at <A NAME="tex2html51"
HREF="http://www-rocq.inria.fr/scilab/"><TT>http://www-rocq.inria.fr/scilab/</TT></A>
doing about the same as matlab. It is free but copyrighted software.
<P>
<H2><A NAME="SECTION00076000000000000000">
<SPAN CLASS="arabic">5</SPAN>.<SPAN CLASS="arabic">6</SPAN> Mouse in my interactive terminal does not work</A>
</H2>
<P>
If your mouse is not working, try to hit 'm' in the interactive terminal to
switch mousing on/off. See below for the list of supported interactive
terminals.
<P>
If it still does not run, then either gnuplot has not been configured or
compiled with mouse support, or you have not properly installed it, or running
an older version of gnuplot (check your <TT>PATH</TT>).
<P>
If your gnuplot is running as the plotting engine of Octave under X11, then
please put <TT>set mouse</TT> into your <TT>$HOME/.gnuplot</TT> (preferred
than putting <TT>gset mouse</TT> into <TT>$HOME/.octaverc</TT>). This is
needed only for gnuplot 4.0: according to its <TT>help x11_mouse</TT>,
gnuplot 4.0 under x11 running through a pipe needs <TT>set mouse</TT> to be
executed before launching the x11 plot window.
<P>
<H2><A NAME="SECTION00077000000000000000">
<SPAN CLASS="arabic">5</SPAN>.<SPAN CLASS="arabic">7</SPAN> How to use hotkeys in my interactive terminals</A>
</H2>
<P>
There are several hotkeys available in interactive terminals.
Currently the following interactive terminals support hotkeys and mousing:
OS/2 Presentation Manager, X11, Windows, WX, and GGI. Hit 'h' in the terminal
to get list of hotkeys.
See <TT>help new-features</TT> or the <SPAN CLASS="textbf">Features introduced in version 4.0</SPAN>
section in the docs for a brief guide over mousing and hotkeys.
Further, you may read <TT>help mouse</TT> and <TT>help bind</TT> for more
information.
<P>
<H2><A NAME="SECTION00078000000000000000">
<SPAN CLASS="arabic">5</SPAN>.<SPAN CLASS="arabic">8</SPAN> I have ported <SPAN CLASS="textbf">gnuplot</SPAN> to another system, or patched it. What
do I do?</A>
</H2>
<P>
If your patch is small, mail it to
<A NAME="tex2html52"
HREF="mailto:gnuplot-beta@lists.sourceforge.net"><TT>gnuplot-beta@lists.sourceforge.net</TT></A>,
with a thorough description of what the patch is supposed to
do, which version of <SPAN CLASS="textbf">gnuplot</SPAN> it is relative to, etc. Well, please do it
always with respect to the current development version of gnuplot (see 'cvs'
above).
<P>
Nowadays, the preferred way of submitting, commenting and upgrading patches are
via 'Patches' section on
<A NAME="tex2html53"
HREF="http://sourceforge.net/tracker/?group_id=2055&atid=302055"><TT>http://sourceforge.net/tracker/?group_id=2055&atid=302055</TT></A>.
You may want to send a note to <A NAME="tex2html54"
HREF="mailto:gnuplot-beta@lists.sourceforge.net"><TT>gnuplot-beta@lists.sourceforge.net</TT></A>
for
more lively discussion.
<P>
<H2><A NAME="SECTION00079000000000000000">
<SPAN CLASS="arabic">5</SPAN>.<SPAN CLASS="arabic">9</SPAN> I want to help in developing the next version of <SPAN CLASS="textbf">gnuplot</SPAN>.
What can I do?</A>
</H2>
<P>
Join the <SPAN CLASS="textbf">gnuplot</SPAN> beta test mailing list by sending a mail
containing the line
<code>subscribe gnuplot-beta</code>
in the body (not the subject) of the mail to
<A NAME="tex2html55"
HREF="mailto:Majordomo@lists.sourceforge.net"><TT>Majordomo@lists.sourceforge.net</TT></A>.
<P>
<H2><A NAME="SECTION000710000000000000000">
<SPAN CLASS="arabic">5</SPAN>.<SPAN CLASS="arabic">10</SPAN> Open questions for inclusion into the FAQ?</A>
</H2>
<P>
Please submit your questions (along with the answer) to
<A NAME="tex2html56"
HREF="mailto:gnuplot-beta@lists.sourceforge.net"><TT>gnuplot-beta@lists.sourceforge.net</TT></A>.
<P>
<H1><A NAME="SECTION00080000000000000000">
<SPAN CLASS="arabic">6</SPAN> Making life easier</A>
</H1>
<P>
<H2><A NAME="SECTION00081000000000000000">
<SPAN CLASS="arabic">6</SPAN>.<SPAN CLASS="arabic">1</SPAN> How do I plot two functions in non-overlapping regions?</A>
</H2>
<P>
Use a parametric plot. An example:
<PRE>
gnuplot> set parametric
gnuplot> a=1
gnuplot> b=3
gnuplot> c=2
gnuplot> d=4
gnuplot> x1(t) = a+(b-a)*t
gnuplot> x2(t) = c+(d-c)*t
gnuplot> f1(x) = sin(x)
gnuplot> f2(x) = x**2/8
gnuplot> plot [t=0:1] x1(t),f1(x1(t)) title "f1", x2(t), f2(x2(t)) title "f2"
</PRE>
<P>
You can also use <SPAN CLASS="textbf">gnuplot</SPAN>'s ability to ignore mathematically undefined
expressions: the expression <code>1/0</code> is silently ignored, thus a
construction like
<PRE>
gnuplot> set xran [-10:10]
gnuplot> plot (abs(x)>0.5?1/0: x**2)
</PRE>
plots a quadratic function only for <code>|x| < 0.5</code>.
<P>
<H2><A NAME="SECTION00082000000000000000">
<SPAN CLASS="arabic">6</SPAN>.<SPAN CLASS="arabic">2</SPAN> How do I run my data through a filter before plotting?</A>
</H2>
<P>
If your system supports the popen() function, as Unix does, you
should be able to run the output through another process, for
example a short awk program, such as
<P>
<PRE>
gnuplot> plot "< awk ' { print $1, $3/$2 } ' file.in"
</PRE>
<P>
The plot command is very powerful and is able to do some
arithmetic on datafiles. See <code>help plot</code>.
<P>
The above filtering works seamlessly under Unixes and OS/2. It can work under MS
Windows as well, but that is for experienced users: (A) When gnuplot has been
compiled by cygwin with the unixish way of <code>./configure</code>; <code>make</code> with
X11 terminal instead of the 'windows' terminal. You have to run this under an
X-server. This procedure is out of knowledge for usual users, but powerful
for others. (B) Compile gnuplot yourself by <code>makefile.mgw</code> or
<code>makefile.cyg</code> and set <code>PIPES=1</code> therein. The drawback is that
each <code>wgnuplot.exe</code> will be accompanied by a boring shell box.
<P>
<H2><A NAME="SECTION00083000000000000000">
<SPAN CLASS="arabic">6</SPAN>.<SPAN CLASS="arabic">3</SPAN> How do I make it easier to use <SPAN CLASS="textbf">gnuplot</SPAN> with <SPAN CLASS="logo,LaTeX">L<SUP><SMALL>A</SMALL></SUP>T<SMALL>E</SMALL>X</SPAN>?</A>
</H2>
<P>
There is a set of <SPAN CLASS="logo,LaTeX">L<SUP><SMALL>A</SMALL></SUP>T<SMALL>E</SMALL>X</SPAN> macros and shell scripts that are meant
to make your life easier when using <SPAN CLASS="textbf">gnuplot</SPAN> with <SPAN CLASS="logo,LaTeX">L<SUP><SMALL>A</SMALL></SUP>T<SMALL>E</SMALL>X</SPAN>. This
package can be found on <A NAME="tex2html57"
HREF="ftp://ftp.dartmouth.edupub/gnuplot/latex.shar"><TT>ftp.dartmouth.edu</TT> in <TT>pub/gnuplot/latex.shar</TT></A>,
by David Kotz.
For example, the program "plotskel" can turn a gnuplot-output
file plot.tex into a skeleton file skel.tex, that has the same
size as the original plot but contains no graph. With the right
macros, the skeleton can be used for preliminary <SPAN CLASS="logo,LaTeX">L<SUP><SMALL>A</SMALL></SUP>T<SMALL>E</SMALL>X</SPAN> passes,
reserving the full graph for later passes, saving tremendous
amounts of time.
<P>
<H2><A NAME="SECTION00084000000000000000">
<SPAN CLASS="arabic">6</SPAN>.<SPAN CLASS="arabic">4</SPAN> How do I save and restore my settings?</A>
</H2>
<P>
Use the <code>save</code> and <code>load</code> commands for this; see <code>help save</code>
and <code>help load</code> for details.
<P>
You can save the current terminal and restore it later without touching the
filesystem by <TT>set term push</TT> and <TT>set term pop</TT>, respectively.
<P>
<H2><A NAME="SECTION00085000000000000000">
<SPAN CLASS="arabic">6</SPAN>.<SPAN CLASS="arabic">5</SPAN> How do I plot lines (not grids) using splot?</A>
</H2>
<P>
If the data in a data file for splot is arranged in such a way
that each one has the same number of data points (using blank
lines as delimiters, as usual), splot will plot the data with a
grid. If you want to plot just lines, use a different number of
data entries (you can do this by doubling the last data point,
for example). Don't forget to <TT>set parametric</TT> mode, of course.
<P>
<H2><A NAME="SECTION00086000000000000000">
<SPAN CLASS="arabic">6</SPAN>.<SPAN CLASS="arabic">6</SPAN> How do I plot a function f(x,y) that is bounded by other
functions in the x-y plane?</A>
</H2>
<P>
An example:
<PRE>
gnuplot> f(x,y) = x**2 + y **2
gnuplot> x(u) = 3*u
gnuplot> yu(x) = x**2
gnuplot> yl(x) = -x**2
gnuplot> set parametric
gnuplot> set cont
gnuplot> splot [0:1] [0:1] u,yl(x(u))+(yu(x(u)) - yl(x(u)))*v,\
> f(x(u), (yu(x(u)) - yl(x(u)))*v)
</PRE>
<P>
<H2><A NAME="SECTION00087000000000000000">
<SPAN CLASS="arabic">6</SPAN>.<SPAN CLASS="arabic">7</SPAN> How do I turn off <feature> in a plot?</A>
</H2>
<P>
Most gnuplot features are controlled by a corresponding set/unset command.
If a feature is enabled by default, or by using <code>set <feature></code>, then you
should be able to turn it by using <code>set no<feature></code>. However, the prefered
syntax since version 4.0 is <code>unset <feature></code>.
<P>
<H2><A NAME="SECTION00088000000000000000">
<SPAN CLASS="arabic">6</SPAN>.<SPAN CLASS="arabic">8</SPAN> How do I call <SPAN CLASS="textbf">gnuplot</SPAN> from my own programs?</A>
</H2>
<P>
On unix-like systems, commands to gnuplot can be piped via stdin.
Output from <SPAN CLASS="textbf">gnuplot</SPAN>'s <code>print</code> command can be read via a named pipe.
On M$ Windows platforms, due to the lacking standard
input (stdin) in GUI programs, you need to use the helper program <TT>pgnuplot</TT>
which should be included in your gnuplot for M$W distribution package.
Reading <SPAN CLASS="textbf">gnuplot</SPAN> output may be impossible.
<P>
<H2><A NAME="SECTION00089000000000000000">
<SPAN CLASS="arabic">6</SPAN>.<SPAN CLASS="arabic">9</SPAN> What if I need h-bar (Planck's constant)?</A>
</H2>
<P>
The most straightforward way is to use a UTF-8 font, and type in the
<SPAN CLASS="MATH"><IMG
WIDTH="14" HEIGHT="34" ALIGN="MIDDLE" BORDER="0"
SRC="img1.png"
ALT="$\hbar$"></SPAN> character (Unicode code point #x210F) directly.
<P>
This does not work in PostScript, however, so you must use approximations
like
<code> @{/=56 -} {/=24 h}</code> or
<code> {/=8 @{/Symbol=24 -} _{/=14 h}}</code>
In the latter, the "-" (a long one in /Symbol) is non-spacing and 24-pt.
The 14-pt "h" is offset by an 8-pt space (which is the space preceding
the "_") but smaller, since it's written as a subscript.
But these don't look too much like the hbar we're used to, since the bar
is horizontal instead of sloped. I don't see a way to get that. I
tried using an accent (character 264 in iso-latin-1 encoding), but I haven't found a
way to scale and position the pieces correctly.
One more possibility would be <code>{/=14 @^{/Symbol=10 -}{/=14 h}}</code>.
<P>
The reduced Planck's constant can be set very easily by using the
AMS-LaTeX PostScript fonts which are available from
<A NAME="tex2html58"
HREF="http://www.ams.org/tex/amsfonts.html"><TT>http://www.ams.org/tex/amsfonts.html</TT></A>
(also included in many LaTeX
distributions). <SPAN CLASS="textbf">Gnuplot</SPAN> (confer the help about <code> fontpath</code>) and the
PostScript interpreter (usually Ghostscript) have to know where the
file <code> msbm10.pfb</code> (or <code> msbm10.pfa</code>) resides. Use
<code> {/MSBM10 \175}</code> to produce <code> \hslash</code> which is a "h"
superimposed by a sloped bar. The standard <code> \hbar</code> (horizontal
bar) has the octal code 176. Please note that h-bar exists only as an
italic type.
<P>
<H2><A NAME="SECTION000810000000000000000">
<SPAN CLASS="arabic">6</SPAN>.<SPAN CLASS="arabic">10</SPAN> What if I need the Solar mass symbol?</A>
</H2>
<P>
As with Planck's constant, the most straightforward way is to use a
UTF-8 font, and type in the <SPAN CLASS="MATH"><IMG
WIDTH="18" HEIGHT="32" ALIGN="MIDDLE" BORDER="0"
SRC="img2.png"
ALT="$\odot$"></SPAN> character (Unicode code point #x2299 ; "circled dot operator") directly.
The very similar glyph at code point #x2609 ; "sun" may be even better, but not many fonts have it.
<P>
<H2><A NAME="SECTION000811000000000000000">
<SPAN CLASS="arabic">6</SPAN>.<SPAN CLASS="arabic">11</SPAN> How do I produce blank output page?</A>
</H2>
<P>
Well, you probably don't want a blank page, but page with a just a title
(overprinting title in another graph in multiplot page):
<P>
<PRE>
reset; unset xtics; unset ytics
unset border; unset key
set title 'Title on an empty page'
plot [][0:1] 2
</PRE>
<P>
<H2><A NAME="SECTION000812000000000000000">
<SPAN CLASS="arabic">6</SPAN>.<SPAN CLASS="arabic">12</SPAN> How do I produce graph of an exact border size?</A>
</H2>
<P>
Well, you can achieve exact size only without tic labels. Then the graph size
is the same as the border size:
<P>
<PRE>
set format ''
set border lt 1
set lmargin at screen 0
set bmargin at screen 0
set rmargin at screen 1
set tmargin at screen 1
plot x, -x
set term png size 300,300; set out 'a.png'
replot
set term pop; set out
</PRE>
<P>
For area smaller by 5 % on each side, you can try for example:
<P>
<PRE>
set lmargin at screen 0.05
set bmargin at screen 0.05
set rmargin at screen 0.95
set tmargin at screen 0.95
</PRE>
<P>
<H1><A NAME="SECTION00090000000000000000">
<SPAN CLASS="arabic">7</SPAN> Common problems</A>
</H1>
<P>
<H2><A NAME="SECTION00091000000000000000">
<SPAN CLASS="arabic">7</SPAN>.<SPAN CLASS="arabic">1</SPAN> Help! None of my fonts work.</A>
</H2>
<P>
Gnuplot does not do font handling by itself; it must necessarily leave
that to the individual device support libraries. Unfortunately, this
means that different terminal types need different help in finding
fonts. Here are some quick hints. For more detailed information please
see the gnuplot documentation for the specific terminal type you are
having problems with.
<P>
<DL>
<DT><STRONG>png/jpeg/gif</STRONG></DT>
<DD>These terminal types use the libgd support library, which
searches for fonts in the directories given in the environmental variable
GDFONTPATH. Once you get libgd fontpaths sorted out, you will probably
want to set a default font for gnuplot.
For example: <code>setenv GNUPLOT_DEFAULT_GDFONT verdana</code>
</DD>
<DT><STRONG>pdf</STRONG></DT>
<DD>The libpdf support library should have come with an associated
font configuration file, usually installed as /usr/local/share/pdflib.upr.
The environmental variable PDFLIBRESOURCE should point to this file.
</DD>
<DT><STRONG>post</STRONG></DT>
<DD>PostScript font names are not resolved until the document
is printed. Gnuplot does not know what fonts are available to your
printer, so it will accept any font name you give it. However, it
is possible to bundle a font with the gnuplot output; please see the
instructions given by gnuplot's internal command ``help set term
post fontfile''.
</DD>
<DT><STRONG>svg</STRONG></DT>
<DD>Font handling is viewer-dependent.
</DD>
<DT><STRONG>x11</STRONG></DT>
<DD>The x11 terminal uses the normal x11 font server mechanism.
The only tricky bit is that in order to use multi-byte fonts you must
explicitly say so:
<PRE>
set term x11 font "mbfont:sazanami mincho,vera,20"
</PRE>
</DD>
<DT><STRONG>win</STRONG></DT>
<DD>Right-click in the control window, then select "Choose font"
from the pull-down menu.
</DD>
<DT><STRONG>wxt</STRONG></DT>
<DD>On linux systems, the wxt terminal can find fonts indexed
by the fontconfig utility.
</DD>
</DL>
<P>
<H2><A NAME="SECTION00092000000000000000">
<SPAN CLASS="arabic">7</SPAN>.<SPAN CLASS="arabic">2</SPAN> <SPAN CLASS="textbf">Gnuplot</SPAN> is not plotting any points under X11! How come?</A>
</H2>
On VMS, you need to make several symbols:
<P>
<PRE>
$ gnuplot_x11 :== $disk:[directory]gnuplot_x11
$ gnuplot :== $disk:[directory]gnuplot.exe
$ def/job GNUPLOT$HELP disk:[directory]gnuplot.hlb
</PRE>
<P>
Then run <SPAN CLASS="textbf">gnuplot</SPAN> from your command line, and use
<code>set term x11</code>.
<P>
If you run <SPAN CLASS="textbf">gnuplot</SPAN> on Unix systems, be sure that the newest
<code>gnuplot_x11</code> is the first in your search path.
Command <code>which gnuplot_x11</code> will help you.
<P>
<H2><A NAME="SECTION00093000000000000000">
<SPAN CLASS="arabic">7</SPAN>.<SPAN CLASS="arabic">3</SPAN> Why does <SPAN CLASS="textbf">gnuplot</SPAN> ignore my very small numbers?</A>
</H2>
<P>
<SPAN CLASS="textbf">Gnuplot</SPAN> treats all numbers less than 1e-08 as zero, by default.
Thus, if you are trying to plot a collection of very small
numbers, they may be plotted as zero. Worse, if you're plotting
on a log scale, they will be off scale. Or, if the whole set of
numbers is "zero", your range may be considered empty:
<P>
<PRE>
gnuplot> plot 'test1'
Warning: empty y range [4.047e-19:3e-11], adjusting to [-1:1]
gnuplot> set yrange [4e-19:3e-11]
gnuplot> plot 'test1'
^
y range is less than `zero`
</PRE>
<P>
The solution is to change <SPAN CLASS="textbf">gnuplot</SPAN>'s idea of "zero":
<PRE>
gnuplot> set zero 1e-20
</PRE>
<P>
For more information, type <code>help set zero</code>.
<P>
<H2><A NAME="SECTION00094000000000000000">
<SPAN CLASS="arabic">7</SPAN>.<SPAN CLASS="arabic">4</SPAN> <SPAN CLASS="textbf">Gnuplot</SPAN> is not plotting on the screen when run from command
line via '<TT>gnuplot filename.gp</TT>'</A>
</H2>
<P>
Obviously, it draws (unless there is an error in the script file), but the plot
dissappears immediately when the script is completed.
<P>
Solution 1: Put a <code>pause -1</code> after the plot command in the file, or at the
file end.
<P>
Solution 2: Use command <code>gnuplot filename.gp -</code> (yes, dash is the last
parameter) to stay in the interactive regime when the script completes.
<P>
Solution 3A: On an X-Window System system, you can also use the <code>-persist</code>
option, the X11 window is then not closed. Close the X11 window by typing "q"
when the focus is on it.
<P>
Solution 3B: On M$ Windows, you can also use either <code>-persist</code> or
<code>/noend</code>.
<P>
Solution 4: For OS/2 PM terminal, use <code>set term pm persist</code> or
<code>set term pm server</code>. For X11 terminal, use <code>set term x11 persist</code>.
<P>
<H2><A NAME="SECTION00095000000000000000">
<SPAN CLASS="arabic">7</SPAN>.<SPAN CLASS="arabic">5</SPAN> My formulas (like 1/3) are giving me nonsense results! What's going on?</A>
</H2>
<P>
<SPAN CLASS="textbf">Gnuplot</SPAN> does integer, and not floating point, arithmetic on
integer expressions. For example, the expression 1/3 evaluates
to zero. If you want floating point expressions, supply
trailing dots for your floating point numbers. Example:
<P>
<PRE>
gnuplot> print 1/3
0
gnuplot> print 1./3.
0.333333
</PRE>
<P>
This way of evaluating integer expressions is shared by both C and Fortran.
<P>
<H2><A NAME="SECTION00096000000000000000">
<SPAN CLASS="arabic">7</SPAN>.<SPAN CLASS="arabic">6</SPAN> My output files are incomplete!</A>
</H2>
<P>
You may need to flush the output with a closing <code>set output</code>.
Some output formats (postscript, pdf, latex, svg, ...) can include several
pages of plots in a single output file. For these output modes, gnuplot
leaves the file open after each plot so that you can add additional plots
to it. The file is not completed and made available to external applications
until you explicitly close it (<code>set output</code> or <code>unset output</code>),
or select a different terminal type (<code>set term</code>) or exit gnuplot.
Output formats that contain only a single 'page' (png, emf, ...)
should not suffer from this problem.
<P>
<H2><A NAME="SECTION00097000000000000000">
<SPAN CLASS="arabic">7</SPAN>.<SPAN CLASS="arabic">7</SPAN> When using the <SPAN CLASS="logo,LaTeX">L<SUP><SMALL>A</SMALL></SUP>T<SMALL>E</SMALL>X</SPAN>-terminal, there is an error during
the <SPAN CLASS="logo,LaTeX">L<SUP><SMALL>A</SMALL></SUP>T<SMALL>E</SMALL>X</SPAN>-run!</A>
</H2>
<P>
The <SPAN CLASS="logo,LaTeX">L<SUP><SMALL>A</SMALL></SUP>T<SMALL>E</SMALL>X</SPAN>2e-core no longer includes the commands
"<SPAN CLASS="MATH"><IMG
WIDTH="14" HEIGHT="34" ALIGN="MIDDLE" BORDER="0"
SRC="img3.png"
ALT="$\backslash$"></SPAN>Diamond" and "<SPAN CLASS="MATH"><IMG
WIDTH="14" HEIGHT="34" ALIGN="MIDDLE" BORDER="0"
SRC="img3.png"
ALT="$\backslash$"></SPAN>Box"; they are included in the latexsym package.
Other symbols are taken from the amssymb package.
Both of these are part of the base distribution and thus part of any LaTeX
implementation. Please remember to include these packages in your LaTeX document.
<P>
<H2><A NAME="SECTION00098000000000000000">
<SPAN CLASS="arabic">7</SPAN>.<SPAN CLASS="arabic">8</SPAN> I can't find the demos and example files at the URLs in the
documentation!</A>
</H2>
<P>
The examples have been removed from the NASA site mentioned in older
documentation. You can find demos from the current version at
<A NAME="tex2html59"
HREF="http://gnuplot.sourceforge.net/demo"><TT>http://gnuplot.sourceforge.net/demo</TT></A>. Examples from the development version
are at <A NAME="tex2html60"
HREF="http://gnuplot.sourceforge.net/demo_cvs"><TT>http://gnuplot.sourceforge.net/demo_cvs</TT></A>.
<P>
<H2><A NAME="SECTION00099000000000000000">
<SPAN CLASS="arabic">7</SPAN>.<SPAN CLASS="arabic">9</SPAN> Calling <SPAN CLASS="textbf">gnuplot</SPAN> in a pipe or with a <SPAN CLASS="textbf">gnuplot</SPAN>-script
doesn't produce a plot!</A>
</H2>
<P>
You can call <SPAN CLASS="textbf">gnuplot</SPAN> by using a short Perl-script like the
following:
<PRE>
#!/usr/local/bin/perl -w
open (GP, "|/usr/local/bin/gnuplot -persist") or die "no gnuplot";
# force buffer to flush after each write
use FileHandle;
GP->autoflush(1);
print GP,"set term x11;plot '/tmp/data.dat' with lines\n";
close GP
</PRE>
<P>
<SPAN CLASS="textbf">Gnuplot</SPAN> closes its plot window on exit. The <code>close GP</code>
command is executed, and the plot window is closed even before you have
a chance to look at it.
<P>
There are three solutions to this: first, use the <code>pause -1</code>
command in <SPAN CLASS="textbf">gnuplot</SPAN> before closing the pipe. Second, close the pipe
only if you are sure that you don't need <SPAN CLASS="textbf">gnuplot</SPAN> and its plot window
anymore. Last, you can use the command line option <code>-persist</code>: this
option leaves the X-Window System plot window open.
<P>
<H1><A NAME="SECTION000100000000000000000">
<SPAN CLASS="arabic">8</SPAN> Credits</A>
</H1>
<P>
<SPAN CLASS="textbf">Gnuplot</SPAN> 3.7's main contributors are (in alphabetical order)
Hans-Bernhard Broeker, John Campbell, Robert Cunningham, David Denholm,
Gershon Elber, Roger Fearick, Carsten Grammes, Lucas Hart, Lars Hecking,
Thomas Koenig, David Kotz, Ed Kubaitis, Russell Lang, Alexander Lehmann,
Alexander Mai, Carsten Steger, Tom Tkacik, Jos Van der Woude, James R.
Van Zandt, and Alex Woo. Additional substantial contributors to version 4.0
include Ethan Merritt, Petr Mikulík and Johannes Zellner.
Version 4.2 and 4.4 releases were coordinated by Ethan Merritt.
<P>
This list was initially compiled by John Fletcher with contributions
from Russell Lang, John Campbell, David Kotz, Rob Cunningham, Daniel
Lewart and Alex Woo. Reworked by Thomas Koenig from a draft
by Alex Woo, with corrections and additions from Alex Woo, John
Campbell, Russell Lang, David Kotz and many corrections from Daniel
Lewart.
Again reworked for <SPAN CLASS="textbf">gnuplot</SPAN> 3.7 by Alexander Mai and Juergen v.Hagen
with corrections by Lars Hecking, Hans-Bernhard Broecker and other
people.
Revised for <SPAN CLASS="textbf">gnuplot</SPAN> 4.0 release by Petr Mikulík and Ethan Merritt.
Revised for <SPAN CLASS="textbf">gnuplot</SPAN> 4.2 release by Petr Mikulík and Ethan Merritt.
Revised for <SPAN CLASS="textbf">gnuplot</SPAN> 4.4 release by Ethan Merritt.
<P>
<H1><A NAME="SECTION000110000000000000000">
About this document ...</A>
</H1>
<STRONG><SPAN CLASS="textbf">Gnuplot</SPAN> FAQ</STRONG><P>
This document was generated using the
<A HREF="http://www.latex2html.org/"><STRONG>LaTeX</STRONG>2<tt>HTML</tt></A> translator Version 2002-2-1 (1.70)
<P>
Copyright © 1993, 1994, 1995, 1996,
<A HREF="http://cbl.leeds.ac.uk/nikos/personal.html">Nikos Drakos</A>,
Computer Based Learning Unit, University of Leeds.
<BR>
Copyright © 1997, 1998, 1999,
<A HREF="http://www.maths.mq.edu.au/~ross/">Ross Moore</A>,
Mathematics Department, Macquarie University, Sydney.
<P>
The command line arguments were: <BR>
<STRONG>latex2html</STRONG> <TT>-split 0 -show_section_numbers -html_version 4.0 -nonavigation faq.tex</TT>
<P>
The translation was initiated by Petr Mikulik on 2010-04-19
<BR><HR>
<ADDRESS>
Petr Mikulik
2010-04-19
</ADDRESS>
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