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<?xml version="1.0" encoding="UTF-8"?>
<!--
*
* This help file was generated from buttap.sci using help_from_sci().
*
-->
<refentry version="5.0-subset Scilab" xml:id="buttap" 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>buttap</refname>
<refpurpose>Design a lowpass analog Butterworth filter.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>
z = buttap (n)
[z, p] = buttap (n)
[z, p, g] = buttap (n)
</synopsis>
</refsynopsisdiv>
<refsection>
<title>Parameters</title>
<variablelist>
<varlistentry><term>n:</term>
<listitem><para> Filter Order</para></listitem></varlistentry>
<varlistentry><term>z:</term>
<listitem><para> Zeros</para></listitem></varlistentry>
<varlistentry><term>p:</term>
<listitem><para> Poles</para></listitem></varlistentry>
<varlistentry><term>g:</term>
<listitem><para> Gain</para></listitem></varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Description</title>
<para>
This is an Octave function.
It designs a lowpass analog Butterworth filter of nth order.
</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example"><![CDATA[
[z, p, g] = buttap (5)
z = [](0x0)
p =
-0.30902 + 0.95106i -0.80902 + 0.58779i -1.00000 + 0.00000i -0.80902 - 0.58779i -0.30902 - 0.95106i
g = 1
]]></programlisting>
</refsection>
</refentry>
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