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git-svn-id: https://svn.php.net/repository/phpdoc/de/trunk@297032 c90b9560-bf6c-de11-be94-00142212c4b1
115 lines
3.2 KiB
XML
115 lines
3.2 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
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<!-- $Revision: 1.1 -->
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<!-- EN-Revision: 96c9d88bad9a7d7d44bfb7f26c226df7ee9ddf26 Maintainer: hholzgra Status: ready -->
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<refentry xml:id="function.log" xmlns="http://docbook.org/ns/docbook">
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<refnamediv>
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<refname>log</refname>
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<refpurpose>Logarithmus</refpurpose>
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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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<para>
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Berechnet den natürlichen Logarithmus von <parameter>arg</parameter>
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beziehnugsweise den Logarithmus von <parameter>arg</parameter> zur
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Basis <parameter>base</parameter> falls der optionale zweite
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Parameter <parameter>base</parameter> gegeben ist.
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</para>
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</refsect1>
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<refsect1 role="parameters">
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&reftitle.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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<listitem>
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<para>
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Der zu verarbeitende Wert
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><parameter>base</parameter></term>
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<listitem>
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<para>
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Optionale Basis für die Berechnung des Logarithmus,
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der Vorgabewert ist 'e' für den natürlichen Logarithmus.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</refsect1>
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<refsect1 role="returnvalues">
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&reftitle.returnvalues;
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<para>
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Der Logarithmus von <parameter>arg</parameter>
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zur Basis <parameter>base</parameter> bzw. der
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natürliche Logarithmus
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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>Ab 4.3.0</entry>
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<entry>
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Der optionale Parameter <parameter>base</parameter> wurde hinzugefügt.
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Mit älteren Versionen ist die Berechnung des Logarithmus eines
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Wertes <literal>n</literal> zur Basis <literal>b</literal> mit Hilfe
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folgender Formel möglich:
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log<subscript>b</subscript>(n) = log(n)/log(b),
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wobei log hier der natürliche Logarithmus ist.
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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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<simplelist>
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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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</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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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"~/.phpdoc/manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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