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<span class="refentrytitle">GEN27</span>
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<p>GEN27 —
Construct functions from segments of straight lines in breakpoint fashion.
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<div class="refsect1" title="Description">
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<h2>Description</h2>
<p>
Construct functions from segments of straight lines in breakpoint fashion.
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<div class="refsect1" title="Syntax">
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<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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<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>).
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<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.
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<span class="emphasis"><em>y1, y2, y3,</em></span>, etc. -- Breakpoint values attained at the location specified by the preceding x value.
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<th align="left">Note</th>
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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.
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<h2>Examples</h2>
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<pre class="programlisting"><span class="stamnt">f</span> 1 0 257 27 0 0 100 1 200 -1 256 0</pre>
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<p>
This describes a function which begins at 0, rises to 1 at the 100th table location, falls to -1, by the 200th location, and returns to 0 by the end of the table. The interpolation is linear.
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<h2>See Also</h2>
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<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>
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<h2>Credits</h2>
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<td>Author: John ffitch</td>
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<td>University of Bath/Codemist Ltd.</td>
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<td>Bath, UK</td>
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<p>New in Csound version 3.49</p>
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