mirror of
https://github.com/php/doc-de.git
synced 2026-03-24 07:12:15 +01:00
82 lines
2.1 KiB
XML
82 lines
2.1 KiB
XML
<?xml version="1.0" encoding="utf-8"?>
|
|
<!-- $Revision$ -->
|
|
<!-- EN-Revision: 0c9c2dd669fe9395eaa73d487fbd160f9057429a Maintainer: nobody Status: ready -->
|
|
<refentry xmlns="http://docbook.org/ns/docbook" xml:id="function.log1p">
|
|
<refnamediv>
|
|
<refname>log1p</refname>
|
|
<refpurpose>
|
|
Berechnet log(1 + Zahl) mit guter Genauigkeit, auch wenn Zahl nahe bei Null liegt
|
|
</refpurpose>
|
|
</refnamediv>
|
|
|
|
<refsect1 role="description">
|
|
&reftitle.description;
|
|
<methodsynopsis>
|
|
<type>float</type><methodname>log1p</methodname>
|
|
<methodparam><type>float</type><parameter>num</parameter></methodparam>
|
|
</methodsynopsis>
|
|
<para>
|
|
<function>log1p</function> gibt log(1 + <parameter>num</parameter>) zurück,
|
|
das so berechnet wird, dass es auch dann genau ist, wenn der Wert von
|
|
<parameter>num</parameter> sehr nahe bei <literal>0</literal> liegt.
|
|
<function>log</function> liefert in solchen Fällen aufgrund von
|
|
Rundungsfehlern oft nur den Wert von log(1).
|
|
</para>
|
|
</refsect1>
|
|
|
|
<refsect1 role="parameters">
|
|
&reftitle.parameters;
|
|
<para>
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><parameter>num</parameter></term>
|
|
<listitem>
|
|
<para>
|
|
Der zu verarbeitende Wert.
|
|
</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</para>
|
|
</refsect1>
|
|
|
|
<refsect1 role="returnvalues">
|
|
&reftitle.returnvalues;
|
|
<para>
|
|
log(1 + <parameter>num</parameter>).
|
|
</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>
|
|
<!-- Keep this comment at the end of the file
|
|
Local variables:
|
|
mode: sgml
|
|
sgml-omittag:t
|
|
sgml-shorttag:t
|
|
sgml-minimize-attributes:nil
|
|
sgml-always-quote-attributes:t
|
|
sgml-indent-step:1
|
|
sgml-indent-data:t
|
|
indent-tabs-mode:nil
|
|
sgml-parent-document:nil
|
|
sgml-default-dtd-file:"~/.phpdoc/manual.ced"
|
|
sgml-exposed-tags:nil
|
|
sgml-local-catalogs:nil
|
|
sgml-local-ecat-files:nil
|
|
End:
|
|
vim600: syn=xml fen fdm=syntax fdl=2 si
|
|
vim: et tw=78 syn=sgml
|
|
vi: ts=1 sw=1
|
|
-->
|