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<h2>
<span class="refentrytitle">zacl</span>
</h2>
<p>zacl —
Clears one or more variables in the za space.
</p>
</div>
<div class="refsect1">
<a id="idm281472867504968"></a>
<h2>Description</h2>
<p>
Clears one or more variables in the za space.
</p>
</div>
<div class="refsect1">
<a id="idm281472867501256"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>zacl</strong></span> kfirst, klast</pre>
</div>
<div class="refsect1">
<a id="idm281472867499176"></a>
<h2>Performance</h2>
<p>
<span class="emphasis"><em>kfirst</em></span> -- first zk or za location in the range to clear.
</p>
<p>
<span class="emphasis"><em>klast</em></span> -- last zk or za location in the range to clear.
</p>
<p>
<span class="emphasis"><em>zacl</em></span> clears one or more variables in the za space. This is useful for those variables which are used as accumulators for mixing a-rate signals at each cycle, but which must be cleared before the next set of calculations.
</p>
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<div class="refsect1">
<a id="idm281472867431736"></a>
<h2>Examples</h2>
<p>
Here is an example of the zacl opcode. It uses the file <a class="ulink" href="examples/zacl.csd" target="_top"><em class="citetitle">zacl.csd</em></a>.
</p>
<div class="example">
<a id="idm281472867429960"></a>
<p class="title">
<strong>Example 1145. Example of the zacl 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="idm281472687949288"></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>
<span class="c1">; Audio out Audio in No messages</span>
-odac -iadc -d <span class="c1">;;;RT audio I/O</span>
<span class="c1">; For Non-realtime ouput leave only the line below:</span>
<span class="c1">; -o zacl.wav -W ;;; for file output any platform</span>
<span class="nt"></CsOptions></span>
<span class="nt"><CsInstruments></span>
<span class="c1">; Initialize the global variables.</span>
<span class="vg">sr</span> <span class="o">=</span> <span class="mi">44100</span>
<span class="vg">kr</span> <span class="o">=</span> <span class="mi">4410</span>
<span class="vg">ksmps</span> <span class="o">=</span> <span class="mi">10</span>
<span class="vg">nchnls</span> <span class="o">=</span> <span class="mi">1</span>
<span class="c1">; Initialize the ZAK space.</span>
<span class="c1">; Create 1 a-rate variable and 1 k-rate variable.</span>
<span class="nb">zakinit</span> <span class="mi">1</span><span class="p">,</span> <span class="mi">1</span>
<span class="c1">; Instrument #1 -- a simple waveform.</span>
<span class="kd">instr</span> <span class="nf">1</span>
<span class="c1">; Generate a simple sine waveform.</span>
a<span class="n">sin</span> <span class="nb">oscil</span> <span class="mi">20000</span><span class="p">,</span> <span class="mi">440</span><span class="p">,</span> <span class="mi">1</span>
<span class="c1">; Send the sine waveform to za variable #1.</span>
<span class="nb">zaw</span> a<span class="n">sin</span><span class="p">,</span> <span class="mi">1</span>
<span class="kd">endin</span>
<span class="c1">; Instrument #2 -- generates audio output.</span>
<span class="kd">instr</span> <span class="nf">2</span>
<span class="c1">; Read za variable #1.</span>
a<span class="n">1</span> <span class="nb">zar</span> <span class="mi">1</span>
<span class="c1">; Generate the audio output.</span>
<span class="nb">out</span> a<span class="n">1</span>
<span class="c1">; Clear the za variables, get them ready for </span>
<span class="c1">; another pass.</span>
<span class="nb">zacl</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">1</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></span>
<span class="c1">; Table #1, a sine wave.</span>
<span class="nb">f</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">16384</span> <span class="mi">10</span> <span class="mi">1</span>
<span class="c1">; Play Instrument #1 for one second.</span>
<span class="nb">i</span> <span class="mi">1</span> <span class="mi">0</span> <span class="mi">1</span>
<span class="c1">; Play Instrument #2 for one second.</span>
<span class="nb">i</span> <span class="mi">2</span> <span class="mi">0</span> <span class="mi">1</span>
<span class="nb">e</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
</div>
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</div>
<p><br class="example-break" />
</p>
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<div class="refsect1">
<a id="idm281472867425736"></a>
<h2>See Also</h2>
<p>
<a class="link" href="zamod.html" title="zamod"><em class="citetitle">zamod</em></a>,
<a class="link" href="zar.html" title="zar"><em class="citetitle">zar</em></a>,
<a class="link" href="zaw.html" title="zaw"><em class="citetitle">zaw</em></a>,
<a class="link" href="zawm.html" title="zawm"><em class="citetitle">zawm</em></a>,
<a class="link" href="zkcl.html" title="zkcl"><em class="citetitle">ziw</em></a>,
<a class="link" href="zkmod.html" title="zkmod"><em class="citetitle">ziwm</em></a>
</p>
</div>
<div class="refsect1">
<a id="idm281472867418984"></a>
<h2>Credits</h2>
<p>
</p>
<table border="0" summary="Simple list" class="simplelist">
<tr>
<td>Author: Robin Whittle</td>
</tr>
<tr>
<td>Australia</td>
</tr>
<tr>
<td>May 1997</td>
</tr>
</table>
<p>
</p>
<p>New in version 3.45</p>
<p>Example written by Kevin Conder.</p>
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