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<h2>
<span class="refentrytitle">expon</span>
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<p>expon —
Trace an exponential curve between specified points.
</p>
</div>
<div class="refsect1">
<a id="idm281472938984200"></a>
<h2>Description</h2>
<p>
Trace an exponential curve between specified points.
</p>
</div>
<div class="refsect1">
<a id="idm281472938921768"></a>
<h2>Syntax</h2>
<pre class="synopsis">ares <span class="command"><strong>expon</strong></span> ia, idur, ib</pre>
<pre class="synopsis">kres <span class="command"><strong>expon</strong></span> ia, idur, ib</pre>
</div>
<div class="refsect1">
<a id="idm281472938918504"></a>
<h2>Initialization</h2>
<p>
<span class="emphasis"><em>ia</em></span> -- starting value. Zero is illegal for exponentials.
</p>
<p>
<span class="emphasis"><em>ib</em></span> -- value after <span class="emphasis"><em>idur</em></span> seconds. For exponentials, must be non-zero and must agree in sign with <span class="emphasis"><em>ia</em></span>.
</p>
<p>
<span class="emphasis"><em>idur</em></span> -- duration in seconds of the segment. A zero or negative value will cause all initialization to be skipped.
</p>
</div>
<div class="refsect1">
<a id="idm281472938914296"></a>
<h2>Performance</h2>
<p>
These units generate control or audio signals whose values can pass through 2 specified points. The <span class="emphasis"><em>idur</em></span> value may or may not equal the instrument's performance time: a shorter performance will truncate the specified pattern, while a longer one will cause the defined segment to continue on in the same direction.
</p>
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<div class="refsect1">
<a id="idm281472938912184"></a>
<h2>Examples</h2>
<p>
Here is an example of the expon opcode. It uses the file <a class="ulink" href="examples/expon.csd" target="_top"><em class="citetitle">expon.csd</em></a>.
</p>
<div class="example">
<a id="idm281472938910536"></a>
<p class="title">
<strong>Example 254. Example of the expon 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>
<div class="refsect1">
<a id="idm281472770969272"></a>
<pre class="programlisting">
<span class="nt"><CsoundSynthesizer></span>
<span class="nt"><CsOptions></span>
<span class="c1">; Select audio/midi flags here according to platform</span>
-odac <span class="c1">;;;realtime audio out</span>
<span class="c1">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o expon.wav -W ;;; for file output any platform</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span>
<span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">32</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">2</span>
<span class="vg">0dbfs</span> <span class="o">=</span> <span class="mi">1</span>
<span class="kd">instr</span> <span class="nf">1</span>
k<span class="n">pitch</span> <span class="o">=</span> <span class="nb">p6</span>
<span class="c1">;choose between expon or line</span>
<span class="k">if</span> <span class="p">(</span>k<span class="n">pitch</span> <span class="o">==</span> <span class="mi">0</span><span class="p">)</span> <span class="k">then</span>
k<span class="n">pitch</span> <span class="nb">expon</span> <span class="nb">p4</span><span class="p">,</span> <span class="nb">p3</span><span class="p">,</span> <span class="nb">p5</span>
<span class="k">elseif</span> <span class="p">(</span>k<span class="n">pitch</span> <span class="o">==</span> <span class="mi">1</span><span class="p">)</span> <span class="k">then</span>
k<span class="n">pitch</span> <span class="nb">line</span> <span class="nb">p4</span><span class="p">,</span> <span class="nb">p3</span><span class="p">,</span> <span class="nb">p5</span>
<span class="k">endif</span>
a<span class="n">sig</span> <span class="nb">vco2</span> <span class="mf">.6</span><span class="p">,</span> k<span class="n">pitch</span>
<span class="nb">outs</span> a<span class="n">sig</span><span class="p">,</span> a<span class="n">sig</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">2</span> <span class="mi">300</span> <span class="mi">600</span> <span class="mi">0</span> <span class="c1">;if p6=0 then expon is used</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">3</span> <span class="mi">2</span> <span class="mi">300</span> <span class="mi">600</span> <span class="mi">1</span> <span class="c1">;if p6=1 then line is used</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">6</span> <span class="mi">2</span> <span class="mi">600</span> <span class="mi">1200</span> <span class="mi">0</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">9</span> <span class="mi">2</span> <span class="mi">600</span> <span class="mi">1200</span> <span class="mi">1</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">12</span> <span class="mi">2</span> <span class="mi">1200</span> <span class="mi">2400</span> <span class="mi">0</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">15</span> <span class="mi">2</span> <span class="mi">1200</span> <span class="mi">2400</span> <span class="mi">1</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">18</span> <span class="mi">2</span> <span class="mi">2400</span> <span class="mi">30</span> <span class="mi">0</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">21</span> <span class="mi">2</span> <span class="mi">2400</span> <span class="mi">30</span> <span class="mi">1</span>
<span class="nb">e</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
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<p><br class="example-break" />
</p>
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<div class="refsect1">
<a id="idm281472938907032"></a>
<h2>See Also</h2>
<p>
<a class="link" href="expseg.html" title="expseg"><em class="citetitle">expseg</em></a>,
<a class="link" href="expsegr.html" title="expsegr"><em class="citetitle">expsegr</em></a>,
<a class="link" href="line.html" title="line"><em class="citetitle">line</em></a>,
<a class="link" href="linseg.html" title="linseg"><em class="citetitle">linseg</em></a>,
<a class="link" href="linsegr.html" title="linsegr"><em class="citetitle">linsegr</em></a>
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