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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" xmlns:scilab="http://www.scilab.org" xml:lang="en" xml:id="varn">
<refnamediv>
<refname>varn</refname>
<refpurpose>symbolic variable of a polynomial or a rational</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>[symb]=varn(p)
[pm]=varn(p,varname)
</synopsis>
</refsynopsisdiv>
<refsection>
<title>Arguments</title>
<variablelist>
<varlistentry>
<term>p</term>
<listitem>
<para>matrix of polynomials or of rationals</para>
</listitem>
</varlistentry>
<varlistentry>
<term>symb</term>
<listitem>
<para>character string: name of the variable</para>
</listitem>
</varlistentry>
<varlistentry>
<term>varname</term>
<listitem>
<para>
character string: the new name of the variable of <literal>p</literal>, set for <literal>pm</literal>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>pm</term>
<listitem>
<para>matrix of polynomials or of rationals</para>
</listitem>
</varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Description</title>
<para>
<literal>symb=varn(p)</literal> returns in <literal>symb</literal> the symbolic variable of the polynomial <literal>p</literal>
(i.e. <literal>varn(poly(0,'x'))</literal> is <literal>'x'</literal>).
</para>
<para>
<literal>varn(p,'s')</literal> returns a polynomial matrix with same coefficients
as <literal>p</literal> but with <literal>'s'</literal> as symbolic variable (change of variable name).
</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example"><![CDATA[
s = poly(0,'s'); p = [s^2+1,s];
varn(p)
varn(p,'x')
f = %z / (%z-1); f = [f f^2]
varn(f)
varn(f,"x")
]]></programlisting>
</refsection>
<refsection role="see also">
<title>See Also</title>
<simplelist type="inline">
<member>
<link linkend="poly">poly</link>
</member>
<member>
<link linkend="rlist">rlist</link>
</member>
<member>
<link linkend="horner">horner</link>
</member>
</simplelist>
</refsection>
<refsection>
<title>History</title>
<revhistory>
<revision>
<revnumber>5.5.1</revnumber>
<revdescription>
<para>Extension to rationals</para>
</revdescription>
</revision>
</revhistory>
</refsection>
</refentry>
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