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<?xml version="1.0" encoding="UTF-8"?>
<!--
*
* This help file was generated from polyscale.sci using help_from_sci().
*
-->
<refentry version="5.0-subset Scilab" xml:id="polyscale" 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:ns3="http://www.w3.org/1999/xhtml"
xmlns:mml="http://www.w3.org/1998/Math/MathML"
xmlns:scilab="http://www.scilab.org"
xmlns:db="http://docbook.org/ns/docbook">
<refnamediv>
<refname>polyscale</refname>
<refpurpose> scales the roots of a polynomial in the z plane</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>
b = polyscale(a,alpha)
</synopsis>
</refsynopsisdiv>
<refsection>
<title>Description</title>
<para>
b = polyscale(a,alpha) scales the roots of a polynomial in the z-plane, where a is a vector containing the polynomial coefficients and alpha is the scaling factor.
</para>
<para>
If alpha is a real value in the range [0 1], then the roots of a are radially scaled toward the origin in the z-plane. Complex values for alpha allow arbitrary changes to the root locations.
</para>
</refsection>
<refsection>
<title>Parameters</title>
<variablelist>
<varlistentry><term>a:</term>
<listitem><para> vector containing the polynomial coefficients</para></listitem></varlistentry>
</variablelist>
<variablelist>
<varlistentry><term>alpha:</term>
<listitem><para> the scaling vector</para></listitem></varlistentry>
</variablelist>
<variablelist>
<varlistentry><term>b:</term>
<listitem><para>vector of scaled roots. </para></listitem></varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example"><![CDATA[
p=[1 0 0 0 0 0 0 -1]
b=polyscale(p,0.95)
//EXPECTED OUTPUT:b=1. 0. 0. 0. 0. 0. 0. - 0.6983373
]]></programlisting>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example"><![CDATA[
t
p=[1 0 0 0 0 0 0 -1]
b=polyscale(p,0.85)
//EXPECTED OUTPUT:b=1. 0. 0. 0. 0. 0. 0. - 0.3205771
]]></programlisting>
</refsection>
<refsection>
<title>Author</title>
<simplelist type="vert">
<member>Debdeep Dey</member>
</simplelist>
</refsection>
</refentry>
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