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<?xml version="1.0" encoding="UTF-8"?>
<!--
*
* This help file was generated from czt.sci using help_from_sci().
*
-->
<refentry version="5.0-subset Scilab" xml:id="czt" 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>czt</refname>
<refpurpose>Chirp Z Transform</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>
czt (x)
czt (x, m)
czt (x, m, w)
czt (x, m, w, a)
</synopsis>
</refsynopsisdiv>
<refsection>
<title>Parameters</title>
<variablelist>
<varlistentry><term>x:</term>
<listitem><para> Input scalar or vector</para></listitem></varlistentry>
<varlistentry><term>m:</term>
<listitem><para> Total Number of steps</para></listitem></varlistentry>
<varlistentry><term>w:</term>
<listitem><para> ratio between points in each step</para></listitem></varlistentry>
<varlistentry><term>a:</term>
<listitem><para> point in the complex plane</para></listitem></varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Description</title>
<para>
This is an Octave function.
Chirp z-transform. Compute the frequency response starting at a and stepping by w for m steps. a is a point in the complex plane, and w is the ratio between points in each step (i.e., radius increases exponentially, and angle increases linearly).
</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example"><![CDATA[
m = 32; ## number of points desired
w = exp(-j*2*pi*(f2-f1)/((m-1)*Fs)); ## freq. step of f2-f1/m
a = exp(j*2*pi*f1/Fs); ## starting at frequency f1
y = czt(x, m, w, a);
]]></programlisting>
</refsection>
</refentry>
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