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<?xml version="1.0" encoding="UTF-8"?>
<!--
*
* This help file was generated from fft21.sci using help_from_sci().
*
-->
<refentry version="5.0-subset Scilab" xml:id="fft21" 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>fft21</refname>
<refpurpose>Calculates the two-dimensional discrete Fourier transform of A using a Fast Fourier Transform algorithm.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Calling Sequence</title>
<synopsis>
fft2 (A, m, n)
fft2 (A)
</synopsis>
</refsynopsisdiv>
<refsection>
<title>Parameters</title>
<variablelist>
<varlistentry><term>A:</term>
<listitem><para> input matrix</para></listitem></varlistentry>
<varlistentry><term>m:</term>
<listitem><para> number of rows of A to be used</para></listitem></varlistentry>
<varlistentry><term>n:</term>
<listitem><para> number of columns of A to be used</para></listitem></varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Description</title>
<para>
This is an Octave function.
It performs two-dimentional FFT on the matrix A. m and n may be used specify the number of rows and columns of A to use. If either of these is larger than the size of A, A is resized and padded with zeros.
If A is a multi-dimensional matrix, each two-dimensional sub-matrix of A is treated separately.
</para>
</refsection>
<refsection>
<title>Examples</title>
<programlisting role="example"><![CDATA[
x = [1 2 3; 4 5 6; 7 8 9]
m = 4
n = 4
fft21 (A, m, n)
ans =
45 + 0i -6 - 15i 15 + 0i -6 + 15i
-18 - 15i -5 + 8i -6 - 5i 5 - 4i
15 + 0i -2 - 5i 5 + 0i -2 + 5i
-18 + 15i 5 + 4i -6 + 5i -5 - 8i
]]></programlisting>
</refsection>
</refentry>
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