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<H1><A NAME="SECTION00880000000000000000"> </A>
<A NAME="example"> </A>
<BR>
Example
</H1>
<P>
As an example of use of the table file system, we here describe
the tutorial procedure executed via the <TT>TUTORIAL/TABLE</TT>
command. This procedure uses a subset of the Uppsala General
Catalogue. The format of the catalogue is defined in the file
<TT>ugc.fmt</TT> as follows:
<PRE>
DEFINE/FIELD 9 20 R G11.6 :RA "HOUR"
DEFINE/FIELD 21 32 R G11.6 :DEC "DEGREE"
DEFINE/FIELD 33 44 R G11.6 :DB "ARC.MIN."
DEFINE/FIELD 45 56 R G11.6 :DR "ARC.MIN."
DEFINE/FIELD 57 68 R G11.6 :BT "MAGNITUDE"
DEFINE/FIELD 69 80 R G11.6 :RV "KM.SEC-1"
END
</PRE>
<P>
This file and the actual ASCII data in <TT>ugc.dat</TT> will be copied into your
workspace. The first four lines of the data file have the following layout:<PRE>
12345678901234567890123456789012345678901234567890123456789012345678901234567890
0.0117 15.87 6.500 6.300 12.00 1047.
0.0233 20.47 4.000 3.800 12.70 *
0.2933 59.03 8.000 10.00 * *
0.3583 16.20 5.800 5.100 14.60 *
</PRE>
(The ruler, of course, is not part of the data file.)
<P>
This tutorial shows the usage of some of the basic table file commands
to analyse and display the data set.
<P><PRE>
CREATE/TABLE ugc 10 700 ugc ! create the table file (UGC.tbl)
NAME/COL ugc :RA F11.3 ! change format
NAME/COL ugc :DEC G12.6 ! change format
SHOW/TABLE ugc ! display structure
READ/TABLE ugc @1 @30 ! display a few entries
!
PLOT/TABLE ugc :DR :DB ! plot diameters in red and blue bands
!
REGR/LINEAR ugc :DB :DR ! linear regression on these variables
READ/KEY OUTPUTD ! and display stored coefficients
!
READ/HIST ugc :BT ! display results on terminal
PLOT/HIST ugc :BT ! and plot device
!
SELECT/TAB ugc :BT.LT.13.5 ! select brightest objects
!
STAT/TAB ugc :DR ! do statistics on the subset,
READ/HIST ugc :DR ! display the result
!
PLOT/TAB ugc :BT :RV ! and plot the selected set
!
SELECT/TAB ugc :RV.GT.4000.0 ! select new subset with largest rad.vel.
!
PRINT/TAB ugc ! print them
!
COMPUTE/TAB ugc :MBT = :BT-25.-5.*LOG10(:RV/50) ! compute abs.magnitude
NAME/COL ugc :MBT "ABS.B.MAG." ! include units
!
COMPUTE/TAB ugc :SIZE = :RV*SIN(0.000291*:DB)*20 ! diameter
NAME/COL ugc :SIZE "KPC" ! include units
!
PLOT/TAB ugc :MBT :SIZE ! display result
</PRE>
<P>
=31 =3 =1999
<P>
<BR><HR>
<ADDRESS>
<I>Petra Nass</I>
<BR><I>1999-06-09</I>
</ADDRESS>
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