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<?xml version="1.0" encoding="UTF-8"?>
<!--
*
* This help file was generated from decimate.sci using help_from_sci().
*
-->
<refentry version="5.0-subset Scilab" xml:id="decimate" 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>decimate</refname>
<refpurpose>Decimation — decrease sample rate by integer factor</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>
y = decimate(x,q)
y = decimate(x,q,n)
y = decimate (…, "fir")
</synopsis>
</refsynopsisdiv>
<refsection>
<title>Parameters</title>
<variablelist>
<varlistentry><term>x:</term>
<listitem><para> input sequence</para></listitem></varlistentry>
<varlistentry><term>q:</term>
<listitem><para> reduction factor </para></listitem></varlistentry>
<varlistentry><term>n:</term>
<listitem><para> filter order</para></listitem></varlistentry>
<varlistentry><term>ftype:</term>
<listitem><para> filter type: iir or fir</para></listitem></varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Description</title>
<para>
y = decimate(x,q) reduces the sample rate of x, the input signal, by a factor of q.
By default, an order n Chebyshev type I filter is used. If n is not specified, the default is 8.
If the optional argument "fir" is given, an order n FIR filter is used, with a default order of 30 if n is not given.
Note that q must be an integer for this rate change method.
</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example"><![CDATA[
t = 0:.00025:1;
x = sin(2*%pi*30*t) + sin(2*%pi*60*t);
y = decimate(x,4);
subplot(211)
plot2d3((0:120),x(1:121))
subplot(212)
plot2d3((0:30),y(1:31))
]]></programlisting>
</refsection>
<refsection>
<title>Authors</title>
<simplelist type="vert">
<member>Ayush Baid</member>
</simplelist>
</refsection>
</refentry>
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