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<?xml version="1.0" encoding="utf-8"?>

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<!-- $Revision$ -->

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<refentry xml:id='function.expm1' xmlns="http://docbook.org/ns/docbook">

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<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.expm1">

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<refnamediv>

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<refname>expm1</refname>

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<refpurpose>

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Returns exp(number) - 1, computed in a way that is accurate even

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Returns <code>exp($num) - 1</code>, computed in a way that is accurate even

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when the value of number is close to zero

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</refpurpose>

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</refnamediv>

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&reftitle.description;

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<methodsynopsis>

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<type>float</type><methodname>expm1</methodname>

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<methodparam><type>float</type><parameter>arg</parameter></methodparam>

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<methodparam><type>float</type><parameter>num</parameter></methodparam>

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</methodsynopsis>

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<para>

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<function>expm1</function> returns the equivalent to

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'exp(<parameter>arg</parameter>) - 1' computed in a way that is

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accurate even if the value of <parameter>arg</parameter> is near zero,

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a case where 'exp (<parameter>arg</parameter>) - 1' would be

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<code>exp($<parameter>num</parameter>) - 1</code> computed in a way that is

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accurate even if the value of <parameter>num</parameter> is near zero,

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a case where <code>exp($<parameter>num</parameter>) - 1</code> would be

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inaccurate due to subtraction of two numbers that are nearly equal.

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</para>

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</refsect1>

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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 argument to process

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<refsect1 role="returnvalues">

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&reftitle.returnvalues;

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<para>

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'e' to the power of <parameter>arg</parameter> minus one

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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>5.3.0</entry>

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<entry>

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This function is now available on all platforms

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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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<literal>e</literal> to the power of <parameter>num</parameter>, minus one.

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</para>

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</refsect1>

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<refsect1 role="seealso">

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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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