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<?xml version="1.0" encoding="UTF-8"?>
<!--
*
* This help file was generated from polyval.sci using help_from_sci().
*
-->
<refentry version="5.0-subset Scilab" xml:id="polyval" 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>polyval</refname>
<refpurpose>returns the value of a polynomial of degree n evaluated at x. y = polyval(p,x,[],mu) or [y,delta] = polyval(p,x,S,mu) use x^=(x−μ1)/μ2 in place of x.
In this equation, μ1=mean(x)and μ2=std(x). The centering and scaling parameters mu = [μ1,μ2] is optional </refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>
y= polyval(p,x)
[y,delta] = polyval(p,x,S)
</synopsis>
</refsynopsisdiv>
<refsection>
<title>Parameters</title>
<variablelist>
<varlistentry><term>p:</term>
<listitem><para> vector of length n+1 whose elements are the coefficients in descending powers of the polynomial to be evaluated.</para></listitem></varlistentry>
</variablelist>
<variablelist>
<varlistentry><term>x:</term>
<listitem><para> -can be a matrix or a vector. In either case, polyval evaluates p at each element of x.</para></listitem></varlistentry>
</variablelist>
<variablelist>
<varlistentry><term>delta:</term>
<listitem><para>-is an estimate of the standard deviation of the error in predicting a future observation at x by p(x). </para></listitem></varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example"><![CDATA[
p = [3 2 1];
y=polyval(p,[5 7 9])
//EXPECTED OUTPUT:
//y= 86 162 262
]]></programlisting>
</refsection>
</refentry>
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