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<?xml version="1.0" encoding="UTF-8"?>
<!--
* Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
*
* 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" xmlns:scilab="http://www.scilab.org" xml:id="evstr" xml:lang="en">
<refnamediv>
<refname>evstr</refname>
<refpurpose>evaluation of expressions</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>
H = evstr(Z)
[H, ierr] = evstr(Z)
</synopsis>
</refsynopsisdiv>
<refsection>
<title>Arguments</title>
<variablelist>
<varlistentry>
<term>Z</term>
<listitem>
<para>
a matrix of character strings <varname>M</varname> or
<code>list(M,Subexp)</code>
</para>
<variablelist>
<varlistentry>
<term>M</term>
<listitem>
<para>a matrix of character strings.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>Subexp</term>
<listitem>
<para>a vector of character strings.</para>
</listitem>
</varlistentry>
</variablelist>
</listitem>
</varlistentry>
<varlistentry>
<term>H</term>
<listitem>
<para>a matrix.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>ierr</term>
<listitem>
<para>an integer, error indicator.</para>
</listitem>
</varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Description</title>
<para>
Returns the result of the evaluation of the matrix of character
strings <varname>M</varname>. Each element of the matrix must define a
valid Scilab expression.
</para>
<para>
If the evaluation of <varname>M</varname> expression leads to an
error, the single return value version, <code>H = evstr(M)</code>,
raises the error as usual. The two return values version,
<code>[H,ierr] = evstr(M)</code>, on the other hand, produces no
error, but returns the error number in <varname>ierr</varname>.
</para>
<para>
If <varname>Z</varname> is a list, <varname>Subexp</varname> is a
vector of character strings, that defines subexpressions which are
evaluated before evaluating <varname>M</varname>. These subexpressions
must be referred to as <literal>%(k)</literal> in <varname>M</varname>,
where <literal>k</literal> is the subexpression's index in
<varname>Subexp</varname>.
</para>
<para>
<code>evstr('a = 1')</code> is not valid (use <function>execstr</function>
instead).
</para>
<para>
<literal>Nan</literal>, <literal>NaN</literal> will be interpreted as <constant>%nan</constant>.
</para>
<para>
<literal>Inf</literal> will be interpreted as <constant>%inf</constant>.
</para>
<note>
Note that <varname>Z</varname> should not be composed of continuation marks (..).
</note>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example">
a = 1; b = 2;
Z = ['a', 'b'] ;
evstr(Z)
Z = list(['%(1)','%(1)-%(2)'],['a+1','b+1']);
evstr(Z)
evstr('NaN'), evstr('Inf')
//The two return values version
[H, ierr] = evstr(Z) // no error
Z = ['a', 'b', 'c'] ;// the variable c is undefined
[H, ierr] = evstr(Z) // error 4: Undefined variable: c
</programlisting>
</refsection>
<refsection role="see also">
<title>See Also</title>
<simplelist type="inline">
<member>
<link linkend="execstr">execstr</link>
</member>
</simplelist>
</refsection>
</refentry>
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