reference/math/functions/log.xml
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26ce97891946b6ce1d7e79c171802a447e1eea34
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</refnamediv>
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<refsect1 role="description">
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&reftitle.description;
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<methodsynopsis>
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<type>float</type><methodname>log</methodname>
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<methodparam><type>float</type><parameter>arg</parameter></methodparam>
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<methodparam choice="opt"><type>float</type><parameter>base</parameter><initializer>M_E</initializer></methodparam>
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</methodsynopsis>
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<methodsynopsis>
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<type>float</type><methodname>log</methodname>
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<methodparam><type>float</type><parameter>num</parameter></methodparam>
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<methodparam choice="opt"><type>float</type><parameter>base</parameter><initializer><constant>M_E</constant></initializer></methodparam>
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</methodsynopsis>
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<para>
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If the optional <parameter>base</parameter> parameter is specified,
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<function>log</function> returns log<subscript>base</subscript>
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<parameter>arg</parameter>, otherwise <function>log</function>
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returns the natural logarithm of <parameter>arg</parameter>.
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<parameter>num</parameter>, otherwise <function>log</function>
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returns the natural logarithm of <parameter>num</parameter>.
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</para>
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</refsect1>
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<refsect1 role="parameters">
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<para>
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<variablelist>
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<varlistentry>
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<term><parameter>arg</parameter></term>
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<term><parameter>num</parameter></term>
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<listitem>
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<para>
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The value to calculate the logarithm for
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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The logarithm of <parameter>arg</parameter> to
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The logarithm of <parameter>num</parameter> to
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<parameter>base</parameter>, if given, or the
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natural logarithm.
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</para>
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<member><function>log10</function></member>
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<member><function>exp</function></member>
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<member><function>pow</function></member>
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<member><function>error_log</function></member>
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</simplelist>
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</para>
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</refsect1>
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</refentry>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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