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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-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" version="5.0-subset Scilab" xml:lang="en" xml:id="isletter">
<info>
<pubdate>$LastChangedDate: 2006-08-08 16:57:13 +0200 (Tue, 08 Aug 2006) $</pubdate>
</info>
<refnamediv>
<refname>isletter</refname>
<refpurpose> check that characters of a string are alphabetics letters</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>res = isletter(str)</synopsis>
</refsynopsisdiv>
<refsection>
<title>Arguments</title>
<variablelist>
<varlistentry>
<term>str</term>
<listitem>
<para>A character string.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>res</term>
<listitem>
<para>A boolean matrix.</para>
</listitem>
</varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Description</title>
<para><literal>res = isletter(str)</literal> returns an array the same size as str
containing logical %t (true) where the elements of str are letters of
the alphabet and logical %f (false) where they are not.
</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example"><![CDATA[
s = 'A1,B2,C3';
isletter(s)
]]></programlisting>
</refsection>
<refsection role="see also">
<title>See Also</title>
<simplelist type="inline">
<member>
<link linkend="isalphanum">isalphanum</link>
</member>
<member>
<link linkend="isdigit">isdigit</link>
</member>
</simplelist>
</refsection>
</refentry>
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