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<?xml version="1.0" encoding="UTF-8"?>
<refentry version="5.0-subset Scilab" xml:id="evstr" xml:lang="en"
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">
<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>Arguments</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>
<para>Nan, NaN will be interpreted as %nan.</para>
<para>Inf will be interpreted as %inf.</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example">a = 1; b = 2; Z = ['a', 'b'] ; evstr(Z)
a = 1; b = 2; Z = list(['%(1)','%(1)-%(2)'],['a+1','b+1']);
evstr(Z)
evstr('NaN'), evstr('Inf')</programlisting>
</refsection>
<refsection role="see also">
<title>See Also</title>
<simplelist type="inline">
<member><link linkend="execstr">execstr</link></member>
<member><link linkend="evstr">evstr</link></member>
<member><link linkend="execstr">execstr</link></member>
</simplelist>
</refsection>
</refentry>
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