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<div class="refentry" title="cosinv">
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<h2>
<span class="refentrytitle">cosinv</span>
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<p>cosinv —
Performs a arccosine function.
</p>
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<div class="refsect1" title="Description">
<a id="idp16638064"></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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<div class="refsect1" title="Syntax">
<a id="idp16680112"></a>
<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>cosinv</strong></span>(x) (no rate restriction)</pre>
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<div class="refsect1" title="Examples">
<a id="idp16681152"></a>
<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="idp16682128"></a>
<p class="title">
<strong>Example 126. 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>
<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>
<span class="comment">; Audio out Audio in</span>
-odac -iadc <span class="comment">;;;RT audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o cosinv.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="comment">; Initialize the global variables.</span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">kr</span> <span class="op">=</span> 4410
<span class="ohdr">ksmps</span> <span class="op">=</span> 10
<span class="ohdr">nchnls</span> <span class="op">=</span> 1
<span class="comment">; Instrument #1.</span>
<span class="oblock">instr</span> 1
irad <span class="op">=</span> 0.5
i1 <span class="op">=</span> <span class="opc">cosinv</span>(irad)
<span class="opc">print</span> i1
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="comment">; Play Instrument #1 for one second.</span>
<span class="stamnt">i</span> 1 0 1
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
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<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" title="See Also">
<a id="idp16684840"></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" title="Credits">
<a id="idp16689232"></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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