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<?xml version="1.0" encoding="UTF-8"?>
<!--
* Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
* Copyright (C) INRIA -
*
* This file must be used under the terms of the CeCILL.
* This source file is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at
* http://www.cecill.info/licences/Licence_CeCILL_V2.1-en.txt
*
-->
<refentry xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:svg="http://www.w3.org/2000/svg" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:db="http://docbook.org/ns/docbook" xmlns:scilab="http://www.scilab.org" xml:lang="ja" xml:id="isnum">
<refnamediv>
<refname>isnum</refname>
<refpurpose>文字列が数字であるかどうかを調べる</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>呼び出し手順</title>
<synopsis>res = isnum(str)</synopsis>
</refsynopsisdiv>
<refsection>
<title>引数</title>
<variablelist>
<varlistentry>
<term>str</term>
<listitem>
<para>文字列または文字列の行列.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>res</term>
<listitem>
<para>論理値の行列.</para>
</listitem>
</varlistentry>
</variablelist>
</refsection>
<refsection>
<title>説明</title>
<para>
<code>res = isnum(str)</code>は,
<varname>str</varname>が数値を表す場合に<constant>%t</constant>
を返します.
</para>
<para>
<code>isnum</code> は "演算"を処理せずに,
スカラー数値のみを扱います.
例えば, <code>isnum("1+2*3")</code> は <code>%f</code>を返します.
複素数は2つの部分の加算として定義されるため,
対応していません.
</para>
</refsection>
<refsection>
<title>例</title>
<programlisting role="example"><![CDATA[
isnum(['1' , ..
'-1.23' , ..
'+1e+23' , ..
'1d+23' , ..
'A' , ..
'%e' , ..
'%pi' , ..
'%nan' , ..
'Nan' , ..
'%inf' , ..
'Inf' , ..
'1+%i*2' , ..
'%eps-%eps*%i', ..
'%inf+Nan*%i' ])
]]></programlisting>
</refsection>
<refsection role="see also">
<title>参照</title>
<simplelist type="inline">
<member>
<link linkend="isletter">isletter</link>
</member>
<member>
<link linkend="isdigit">isdigit</link>
</member>
<member>
<link linkend="isalphanum">isalphanum</link>
</member>
<member>
<link linkend="evstr">evstr</link>
</member>
</simplelist>
</refsection>
</refentry>
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