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<?xml version="1.0" encoding="UTF-8"?>
<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="evstr">
<info>
<pubdate>$LastChangedDate$</pubdate>
</info>
<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>Parameters</title>
<variablelist>
<varlistentry>
<term>Z</term>
<listitem>
<para>matrix of character strings <literal>M</literal> or <literal>list(M,Subexp)</literal></para>
<variablelist>
<varlistentry>
<term>M</term>
<listitem>
<para>matrix of character strings</para>
</listitem>
</varlistentry>
<varlistentry>
<term>Subexp</term>
<listitem>
<para>vector of character strings</para>
</listitem>
</varlistentry>
</variablelist>
</listitem>
</varlistentry>
<varlistentry>
<term>H</term>
<listitem>
<para>matrix</para>
</listitem>
</varlistentry>
<varlistentry>
<term>ierr</term>
<listitem>
<para>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 <literal>M</literal>. Each element of the matrix must define a valid
Scilab expression.</para>
<para>
If the evaluation of <literal>M</literal> expression leads to an error, the single
return value version, <literal>H=evstr(M)</literal>, raises the error as usual.
The two return values version, <literal>[H,ierr]=evstr(M)</literal>, on the other
hand, produces no error, but returns the error number in <literal>ierr</literal>.</para>
<para>
If <literal>Z</literal> is a list, <literal>Subexp</literal> is a vector of character strings,
that defines sub_expressions which are evaluated before evaluating
<literal>M</literal>. These sub_expressions must be referred to as <literal>%(k)</literal> in
<literal>M</literal>, where <literal>k</literal> is the sub-expression's index in <literal>Subexp</literal>.</para>
<para>
evstr('a=1') is not valid (use <literal>execstr</literal> instead).</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example"><![CDATA[
a=1; b=2; Z=['a','b'] ; evstr(Z)
a=1; b=2; Z=list(['%(1)','%(1)-%(2)'],['a+1','b+1']);
evstr(Z)
]]></programlisting>
</refsection>
<refsection>
<title>See Also</title>
<simplelist type="inline">
<member>
<link linkend="execstr">execstr</link>
</member>
</simplelist>
</refsection>
</refentry>
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