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<refentry id="cent">
<indexterm id="IndexCent"><primary>cent</primary></indexterm>
<refentryinfo><title>Pitch Converters:Functions</title></refentryinfo>
<refmeta>
<refentrytitle>cent</refentrytitle>
</refmeta>
<refnamediv>
<refname>cent</refname>
<refpurpose>
Calculates a factor to raise/lower a frequency by a given amount of cents.
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>
Calculates a factor to raise/lower a frequency by a given amount of cents.
</para>
</refsect1>
<refsect1>
<title>Syntax</title>
<synopsis><command>cent</command>(x) </synopsis>
<para>
This function works at a-rate, i-rate, and k-rate.
</para>
</refsect1>
<refsect1>
<title>Initialization</title>
<para>
<emphasis>x</emphasis> -- a value expressed in cents.
</para>
</refsect1>
<refsect1>
<title>Performance</title>
<para>
The value returned by the <emphasis>cent</emphasis> function is a factor. You can multiply a frequency by this factor to raise/lower it by the given amount of cents.
</para>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
Here is an example of the cent opcode. It uses the file <ulink url="examples/cent.csd"><citetitle>cent.csd</citetitle></ulink>.
<example>
<title>Example of the cent opcode.</title>
<para>See the sections <link linkend="UsingRealTime"><citetitle>Real-time Audio</citetitle></link> and <link linkend="CommandFlags"><citetitle>Command Line Flags</citetitle></link> for more information on using command line flags.</para>
<xi:include href="examples-xml/cent.csd.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/>
</example>
Its output should include lines like:
<screen>
instr 1: iroot = 440.000
instr 1: ifactor = 1.189
instr 1: inew = 523.229</screen>
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<link linkend="db"><citetitle>db</citetitle></link>,
<link linkend="octave"><citetitle>octave</citetitle></link>,
<link linkend="semitone"><citetitle>semitone</citetitle></link>
</para>
</refsect1>
<refsect1>
<title>Credits</title>
<para>Example written by &namekevin;.</para>
<para>New in version 4.16</para>
</refsect1>
</refentry>
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