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<div class="refentry" title="sin">
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<h2>
<span class="refentrytitle">sin</span>
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<p>sin —
Performs a sine function.
</p>
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<div class="refsect1" title="Description">
<a id="idp42999224"></a>
<h2>Description</h2>
<p>
Returns the sine 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">
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<h2>Syntax</h2>
<pre class="synopsis"><span class="command"><strong>sin</strong></span>(x) (no rate restriction)</pre>
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<div class="refsect1" title="Examples">
<a id="idp43010568"></a>
<h2>Examples</h2>
<p>
Here is an example of the sin opcode. It uses the file <a class="ulink" href="examples/sin.csd" target="_top"><em class="citetitle">sin.csd</em></a>.
</p>
<div class="example">
<a id="idp43011544"></a>
<p class="title">
<strong>Example 774. Example of the sin 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>
-odac <span class="comment">;;;realtime audio out</span>
<span class="comment">;-iadc ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o sin.wav -W ;;; for file output any platform</span>
<span class="csdtag"></CsOptions></span>
<span class="csdtag"><CsInstruments></span>
<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 32
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1
<span class="oblock">instr</span> 1
isin1 <span class="op">=</span> <span class="opc">sin</span>(0) <span class="comment">;sine of 0 is 0</span>
isin2 <span class="op">=</span> <span class="opc">sin</span>($M_PI_2) <span class="comment">;sine of pi/2 (1.5707...) is 1</span>
isin3 <span class="op">=</span> <span class="opc">sin</span>($M_PI) <span class="comment">;sine of pi (3.1415...) is 0</span>
isin4 <span class="op">=</span> <span class="opc">sin</span>($M_PI_2 <span class="op">*</span> 3) <span class="comment">;sine of 3/2pi (4.7123...) is -1</span>
isin5 <span class="op">=</span> <span class="opc">sin</span>($M_PI <span class="op">*</span> 2) <span class="comment">;sine of 2pi (6.2831...) is 0</span>
isin6 <span class="op">=</span> <span class="opc">sin</span>($M_PI <span class="op">*</span> 4) <span class="comment">;sine of 4pi is also 0</span>
<span class="opc">print</span> isin1, isin2, isin3, isin4, isin5, isin6
<span class="oblock">endin</span>
<span class="oblock">instr</span> 2 <span class="comment">;sin used in panning, after an example from Hans Mikelson</span>
aout <span class="opc">vco2</span> 0.8, 220 <span class="comment">; sawtooth</span>
kpan <span class="opc">linseg</span> p4, p3, p5 <span class="comment">;0 = left, 1 = right</span>
kpan <span class="op">=</span> kpan<span class="op">*</span>$M_PI_2 <span class="comment">;range 0-1 becomes 0-pi/2</span>
kpanl <span class="op">=</span> <span class="opc">cos</span>(kpan)
kpanr <span class="op">=</span> <span class="opc">sin</span>(kpan)
<span class="opc">outs</span> aout<span class="op">*</span>kpanl, aout<span class="op">*</span>kpanr
<span class="oblock">endin</span>
<span class="csdtag"></CsInstruments></span>
<span class="csdtag"><CsScore></span>
<span class="stamnt">i</span> 1 0 0
<span class="stamnt">i</span> 2 0 5 0 1 <span class="comment">;move left to right</span>
<span class="stamnt">i</span> 2 5 5 1 0 <span class="comment">;move right to left</span>
<span class="stamnt">e</span>
<span class="csdtag"></CsScore></span>
<span class="csdtag"></CsoundSynthesizer></span>
</pre>
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</div>
<p><br class="example-break" />
Its output should include a line like this:
</p>
<pre class="screen">instr 1: isin1 = 0.000 isin2 = 1.000 isin3 = 0.000 isin4 = -1.000 isin5 = -0.000 isin6 = 0.000</pre>
<p>
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<div class="refsect1" title="See Also">
<a id="idp43014248"></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="cosinv.html" title="cosinv"><em class="citetitle">cosinv</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>
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