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<h2>
<span class="refentrytitle">GEN27</span>
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<p>GEN27 —
Construct functions from segments of straight lines in breakpoint fashion.
</p>
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<div class="refsect1" title="Description">
<a id="idp78069000"></a>
<h2>Description</h2>
<p>
Construct functions from segments of straight lines in breakpoint fashion.
</p>
</div>
<div class="refsect1" title="Syntax">
<a id="idp78069688"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>f</strong></span> # time size 27 x1 y1 x2 y2 x3 ...</pre>
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<div class="refsect1" title="Initialization">
<a id="idp78080040"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>size </em></span> -- number of points in the table. Must be a power of 2 or power-of-2 plus 1 (see <a class="link" href="f.html" title="f Statement (or Function Table Statement)"><em class="citetitle">f statement</em></a>).
</p>
<p>
<span class="emphasis"><em>x1, x2, x3,</em></span> etc. -- locations in table at which to attain the following y value. Must be in increasing order. If the last value is less than size, then the rest will be set to zero. Should not be negative but can be zero.
</p>
<p>
<span class="emphasis"><em>y1, y2, y3,</em></span>, etc. -- Breakpoint values attained at the location specified by the preceding x value.
</p>
<div class="note" title="Note" style="margin-left: 0.5in; margin-right: 0.5in;">
<table border="0" summary="Note: Note">
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<td rowspan="2" align="center" valign="top" width="25">
<img alt="[Note]" src="images/note.png" />
</td>
<th align="left">Note</th>
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<p>
If p4 is positive, functions are post-normalized (rescaled to a maximum absolute value of 1 after generation). A negative p4 will cause rescaling to be skipped.
</p>
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<div class="refsect1" title="Examples">
<a id="idp78083304"></a>
<h2>Examples</h2>
<p>
Here is an example of the GEN27 opcode. It uses the file <a class="ulink" href="examples/gen27.csd" target="_top"><em class="citetitle">gen27.csd</em></a>.
</p>
<div class="example">
<a id="idp78139664"></a>
<p class="title">
<strong>Example 1061. Example of the GEN27 opcode.</strong>
</p>
<div class="example-contents">
<p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
<pre class="programlisting">
<span class="csdtag"><CsoundSynthesizer></span>
<span class="csdtag"><CsOptions></span>
<span class="comment">; Select audio/midi flags here according to platform</span>
-odac <span class="comment">;;;realtime audio out</span>
<span class="comment">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o gen27.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 32
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1
gisin <span class="ohdr">ftgen</span> 1, 0, 32768, 10, 1
gienv <span class="ohdr">ftgen</span> 2, 0, 1025, 27, 0, 0,200, 1, 400, <span class="op">-</span>1, 513, 0
<span class="oblock">instr</span> 1
kcps <span class="opc">init</span> 3<span class="op">/</span>p3 <span class="comment">;play 3x over duration of note</span>
kndx <span class="opc">phasor</span> kcps
ixmode <span class="op">=</span> 1 <span class="comment">;normalize to 0-1</span>
kval <span class="opc">table</span> kndx, gienv, ixmode
kval <span class="op">=</span> kval<span class="op">*</span>100 <span class="comment">;scale 0-100</span>
asig <span class="opc">poscil</span> 1, 220<span class="op">+</span>kval, 1 <span class="comment">;add to 220 Hz</span>
<span class="opc">outs</span> asig, asig
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span> 1 0 4
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
</div>
</div>
<p><br class="example-break" />
<span>This is the diagram of the waveform of the GEN27 routine, as used in the example:</span>
</p>
<div class="mediaobject">
<img src="images/gen27.png" alt="f 2 0 1025 27 0 0 200 1 400 -1 513 0 - a function which begins at 0, rises to 1 at the 200th table location, falls to -1, by the 400th location, and returns to 0 by the end of the table. The interpolation is linear" />
<div class="caption">
<p>f 2 0 1025 27 0 0 200 1 400 -1 513 0 - a function which begins at 0, rises to 1 at the 200th table location, falls to -1, by the 400th location, and returns to 0 by the end of the table. The interpolation is linear</p>
</div>
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<p>
</p>
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<div class="refsect1" title="See Also">
<a id="idp78144352"></a>
<h2>See Also</h2>
<p>
<a class="link" href="f.html" title="f Statement (or Function Table Statement)"><em class="citetitle">f statement</em></a>,
<a class="link" href="GEN25.html" title="GEN25"><em class="citetitle">GEN25</em></a>
</p>
</div>
<div class="refsect1" title="Credits">
<a id="idp78145856"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: John ffitch</td>
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<tr>
<td>University of Bath/Codemist Ltd.</td>
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<td>Bath, UK</td>
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<p>
</p>
<p>New in Csound version 3.49</p>
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