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<h2>
<span class="refentrytitle">cosinv</span>
</h2>
<p>cosinv —
Performs a arccosine function.
</p>
</div>
<div class="refsect1">
<a id="idm281472944957096"></a>
<h2>Description</h2>
<p>
Returns the arccosine of <span class="emphasis"><em>x</em></span> (<span class="emphasis"><em>x</em></span> in radians).
</p>
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<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>cosinv</strong></span>(x) (no rate
restriction)</pre>
<pre class="synopsis"><span class="command"><strong>cosinv</strong></span>(k/i[]) (k- or i-arrays )</pre>
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<div class="refsect1">
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<h2>Examples</h2>
<p>
Here is an example of the cosinv opcode. It uses the file <a class="ulink" href="examples/cosinv.csd" target="_top"><em class="citetitle">cosinv.csd</em></a>.
</p>
<div class="example">
<a id="idm281472944949848"></a>
<p class="title">
<strong>Example 154. Example of the cosinv 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="idm281472777903784"></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</span>
-odac -iadc <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 cosinv.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">; Instrument #1.</span>
<span class="kd">instr</span> <span class="nf">1</span>
i<span class="n">rad</span> <span class="o">=</span> <span class="mf">0.5</span>
i<span class="n">1</span> <span class="o">=</span> <span class="nb">cosinv</span><span class="p">(</span>i<span class="n">rad</span><span class="p">)</span>
<span class="nb">print</span> i<span class="n">1</span>
<span class="kd">endin</span>
<span class="nt"></CsInstruments></span>
<span class="nt"><CsScore></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="nb">e</span>
<span class="nt"></CsScore></span>
<span class="nt"></CsoundSynthesizer></span>
</pre>
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</div>
</div>
<p><br class="example-break" />
Its output should include lines like this:
</p>
<pre class="screen">instr 1: i1 = 1.047</pre>
<p>
</p>
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<div class="refsect1">
<a id="idm281472944944888"></a>
<h2>See Also</h2>
<p>
<a class="link" href="cos.html" title="cos"><em class="citetitle">cos</em></a>,
<a class="link" href="cosh.html" title="cosh"><em class="citetitle">cosh</em></a>,
<a class="link" href="sin.html" title="sin"><em class="citetitle">sin</em></a>,
<a class="link" href="sinh.html" title="sinh"><em class="citetitle">sinh</em></a>,
<a class="link" href="sininv.html" title="sininv"><em class="citetitle">sininv</em></a>,
<a class="link" href="tan.html" title="tan"><em class="citetitle">tan</em></a>,
<a class="link" href="tanh.html" title="tanh"><em class="citetitle">tanh</em></a>,
<a class="link" href="taninv.html" title="taninv"><em class="citetitle">taninv</em></a>
</p>
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<div class="refsect1">
<a id="idm281472944936216"></a>
<h2>Credits</h2>
<p>Author: John ffitch</p>
<p>New in version 3.48</p>
<p>Example written by Kevin Conder.</p>
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