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<?xml version="1.0" encoding="UTF-8"?>
<!--
*
* This help file was generated from impinvar.sci using help_from_sci().
*
-->
<refentry version="5.0-subset Scilab" xml:id="impinvar" 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>impinvar</refname>
<refpurpose>This function converts analog filter with coefficients b and a to digital, conserving impulse response.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>
[b, a] = impinvar (b, a)
[b, a] = impinvar (b, a, fs)
[b, a] = impinvar (b, a, fs, tol)
</synopsis>
</refsynopsisdiv>
<refsection>
<title>Parameters</title>
<variablelist>
<varlistentry><term>b:</term>
<listitem><para> real or complex valued scalar or vector</para></listitem></varlistentry>
<varlistentry><term>a:</term>
<listitem><para> real or complex valued scalar or vector, order should be greater than b</para></listitem></varlistentry>
<varlistentry><term>fs:</term>
<listitem><para> real or complex value, default value 1Hz</para></listitem></varlistentry>
<varlistentry><term>tol:</term>
<listitem><para> real or complex value, default value 0.0001</para></listitem></varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Description</title>
<para>
This is an Octave function.
This function converts analog filter with coefficients b and a to digital, conserving impulse response.
This function does the inverse of impinvar.
</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example"><![CDATA[
b = 0.0081000
a = [2.0000000, 0.56435378, 0.4572792, 0.00705544, 0.091000]
[ay,by] = impinvar(b,a,10)
ay =
0.0000e+00 7.5293e-08 2.9902e-07 7.4238e-08
by =
1.00000 -3.96992 5.91203 -3.91428 0.97218
]]></programlisting>
</refsection>
</refentry>
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