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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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@@ -24,7 +24,7 @@

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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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@@ -46,38 +46,11 @@

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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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</refsect1>

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<refsect1 role="changelog">

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&reftitle.changelog;

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<para>

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<informaltable>

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<tgroup cols="2">

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<thead>

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<row>

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<entry>&Version;</entry>

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<entry>&Description;</entry>

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</row>

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</thead>

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<tbody>

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<row>

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<entry>4.3.0</entry>

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<entry>

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The optional parameter <parameter>base</parameter> became available.

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For older versions you can calculate the logarithm in base <literal>b</literal>

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of a number <literal>n</literal>, but using the mathematical identity:

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log<subscript>b</subscript>(n) = log(n)/log(b), where log is the

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neperian (or natural) logarithm.

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</entry>

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</row>

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</tbody>

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</tgroup>

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</informaltable>

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</para>

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</refsect1>

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<refsect1 role="seealso">

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&reftitle.seealso;

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<para>

...

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@@ -85,11 +58,11 @@

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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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