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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.13 $ -->
<refentry xml:id='function.log1p' xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>log1p</refname>
<refpurpose>
Returns log(1 + number), computed in a way that is accurate even when
the value of number is close to zero
</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>float</type><methodname>log1p</methodname>
<methodparam><type>float</type><parameter>number</parameter></methodparam>
</methodsynopsis>
&warn.experimental.func;
<para>
<function>log1p</function> returns log(1 +
<parameter>number</parameter>) computed in a way that is accurante even
when the value of <parameter>number</parameter> is close to zero.
<function>log</function> might only return log(1) in this case
due to lack of precision.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>number</parameter></term>
<listitem>
<para>
The argument to process
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
log(1 + <parameter>number</parameter>)
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<para>
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>5.3.0</entry>
<entry>
This function is now available on all platforms
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>expm1</function></member>
<member><function>log</function></member>
<member><function>log10</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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