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<?xml version="1.0" encoding="UTF-8"?>
<!--
*
* This help file was generated from impz.sci using help_from_sci().
*
-->
<refentry version="5.0-subset Scilab" xml:id="impz" 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>impz</refname>
<refpurpose> It gives Impulse response of digital filter
</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>
x_r = impz(b)
x_r = impz(b, a)
x_r = impz(b, a, n)
x_r = impz(b, a, n, fs)
[x_r, t_r] = impz(b, a, n, fs)
</synopsis>
</refsynopsisdiv>
<refsection>
<title>Parameters</title>
<variablelist>
<varlistentry><term>x_r:</term>
<listitem><para> impz chooses the number of samples and returns the response in the column vector, x_r.</para></listitem></varlistentry>
<varlistentry><term>t_r:</term>
<listitem><para> impz returns the sample times in the column vector, t_r </para></listitem></varlistentry>
<varlistentry><term>b:</term>
<listitem><para> numerator coefficients of the filter</para></listitem></varlistentry>
<varlistentry><term>a:</term>
<listitem><para>denominator coefficients of the filter</para></listitem></varlistentry>
<varlistentry><term>n:</term>
<listitem><para> samples of the impulse response t(by default ,n = length(t) and is computed automatically.</para></listitem></varlistentry>
<varlistentry><term>fs:</term>
<listitem><para>sampling frequency</para></listitem></varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Description</title>
<para>
[x_r,t_r] = impz(b,a) returns the impulse response of the filter with numerator coefficients, b, and denominator coefficients, a. impz chooses the number of samples and returns the response in the column vector, x_r, and the sample times in the column vector, t_r. t_r = [0:n-1]' and n = length(t) is computed automatically.
</para>
</refsection>
<refsection>
<title>Example 1</title>
<programlisting role="example"><![CDATA[
[x_r,t_r]=impz([0 1 1],[1 -3 3 -1],10)
//EXPECTED OUTPUT :
// t_r = 0. 1. 2. 3. 4. 5. 6. 7. 8. 9
// x_r= 0. 1. 4. 9. 16. 25. 36. 49 64 81
]]></programlisting>
</refsection>
<refsection>
<title>Example 2</title>
<programlisting role="example"><![CDATA[
[x_r,t_r]=impz(1,[1 1],5)
//EXPECTED OUTPUT
// t_r = 0. 1. 2. 3. 4
//x_r = 1. - 1. 1. - 1. 1.
]]></programlisting>
</refsection>
</refentry>
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