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<refentry id="log10">
<indexterm id="IndexLog10"><primary>log10</primary></indexterm>
<refentryinfo><title>Mathematical Operations:Mathematical Functions</title></refentryinfo>
<refmeta>
<refentrytitle>log10</refentrytitle>
</refmeta>
<refnamediv>
<refname>log10</refname>
<refpurpose>
Returns a base 10 log.
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<para>
Returns the base 10 log of <emphasis>x</emphasis> (<emphasis>x</emphasis> positive only).
</para>
<para>
The argument value is restricted for <link linkend="log"><citetitle>log</citetitle></link>,
<emphasis>log10</emphasis>, and <link linkend="sqrt"><citetitle>sqrt</citetitle></link>.
</para>
</refsect1>
<refsect1>
<title>Syntax</title>
<synopsis><command>log10</command>(x) (no rate restriction)</synopsis>
<para>
where the argument within the parentheses may be an expression. Value converters perform arithmetic translation from units of one kind to units of another. The result can then be a term in a further expression.
</para>
</refsect1>
<refsect1>
<title>Examples</title>
<para>
Here is an example of the log10 opcode. It uses the file <ulink url="examples/log10.csd"><citetitle>log10.csd</citetitle></ulink>.
<example>
<title>Example of the log10 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/log10.csd.xml" xmlns:xi="http://www.w3.org/2001/XInclude"/>
</example>
Its output should include a line like this:
<screen>instr 1: i1 = 0.903</screen>
</para>
</refsect1>
<refsect1>
<title>See Also</title>
<para>
<link linkend="abs"><citetitle>abs</citetitle></link>,
<link linkend="exp"><citetitle>exp</citetitle></link>,
<link linkend="frac"><citetitle>frac</citetitle></link>,
<link linkend="int"><citetitle>int</citetitle></link>,
<link linkend="log"><citetitle>log</citetitle></link>,
<link linkend="opi"><citetitle>i</citetitle></link>,
<link linkend="sqrt"><citetitle>sqrt</citetitle></link>
</para>
</refsect1>
<refsect1>
<title>Credits</title>
<para>Written by &namejohn;.</para>
<para>New in version 3.47</para>
<para>Example written by &namekevin;.</para>
</refsect1>
</refentry>
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