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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 -
* Copyright (C) Samuel GOUGEON - 2013 : $ is now supported. More examples.
*
* 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:ns5="http://www.w3.org/1999/xhtml" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:db="http://docbook.org/ns/docbook" xml:id="part" xml:lang="en">
<refnamediv>
<refname>part</refname>
<refpurpose>Extraction of characters from strings</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>[strings_out] = part(strings_in, v)</synopsis>
</refsynopsisdiv>
<refsection>
<title>Arguments</title>
<variablelist>
<varlistentry>
<term>strings_in</term>
<listitem>
<para>a character string or matrix of character string.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>v</term>
<listitem>
<para>
a vector of integer values containing the indices of characters to be extracted.
<literal>$</literal> is accepted and means length(strings_in).
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>strings_out</term>
<listitem>
<para>a character string or matrix of character string.</para>
</listitem>
</varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Description</title>
<para>
This function extracts characters from strings. The characters to be
extracted are referred to by their indices contained in <literal>v</literal>.
</para>
<para>
<literal>strings_out</literal> is filled with whitespace characters when indices
are beyond the input string's length.
</para>
<para>
<literal>v</literal> may contain <literal>$</literal> symbol which stands for the
length of <literal>string_in</literal>.
</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example"><![CDATA[
// Returns characters position 8 to 11
part("How to use ""part"" ?", 8:11)
// Returns characters position 2 to 4 for each element
// No characters replaced by ''
c = part(['a', 'abc', 'abcd'], 2:4)
// Returns character position 1 for each element and add characters position
// 4 to 7 of each element
c = part(['abcdefg', 'hijklmn', 'opqrstu'], [1, 4:7]);
// Returns character 4 for each element, add characters position 1 to 7 and
// add character position 4 for each element
c = part(['abcdefg', 'hijklmn', 'opqrstu'], [4, 1:7, 4]);
// Returns character position 1, add again character position 1 and
// character position 2
c=part(['a', 'abc', 'abcd'], [1, 1, 2])
part(['a', 'abc', 'abcd'], [1]) // => ['a' 'a' 'a']
part(['a', 'abc', 'abcd'], [1, 1]) // => ['aa' 'aa' 'aa']
part(['a', 'abc', 'abcd'], [1, 1, 2]) // => ['aa' 'aab' 'aab']
// Repeating a character N times:
N = 10; part('-', ones(1:N)) // => '----------'
// Repeating a pattern N times:
N = 6; pat = '- ';
part(pat, ones(1:N).*.(1:length(pat))) // => '- - - - - - '
// Using $ = implicit length of strings:
// 1)
part(['a string' 'another longer one'], $-2:$ ) // => [ 'ing' 'one']
// 2) Another implementation for strrev():
part('Hello world', $:-1:1) // => 'dlrow olleH'
// 3) With unranging $:
part('Hello world', [ $ 4:5 ]) // => 'dlo'
// 4) Mixing scalar or unrangin $ with ranging ones is not possible:
part("Hello", [ 1 $-1:$ $ ]) // => error
]]></programlisting>
</refsection>
<refsection role="see also">
<title>See Also</title>
<simplelist type="inline">
<member>
<link linkend="string">string</link>
</member>
<member>
<link linkend="strsplit">strsplit</link>
</member>
<member>
<link linkend="length">length</link>
</member>
</simplelist>
</refsection>
<refsection>
<title>History</title>
<revhistory>
<revision>
<revnumber>5.5.0</revnumber>
<revremark>
<literal>$</literal> standing for length(input_strings) is now accepted in indices of selected characters
</revremark>
</revision>
</revhistory>
</refsection>
</refentry>
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