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<title>fftn</title>
<style type="text/css" media="all">
@import url("scilab_code.css");
@import url("xml_code.css");
@import url("c_code.css");
@import url("style.css");
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<span class="path"><a href="index.html">FOSSEE Signal Processing Toolbox</a> >> <a href="section_cc2bc01c47967d47fcf3507a91d572ba.html">FOSSEE Signal Processing Toolbox</a> > fftn</span>
<br /><br />
<div class="refnamediv"><h1 class="refname">fftn</h1>
<p class="refpurpose">This function computes the N-dimensional discrete Fourier transform of A using a Fast Fourier Transform (FFT) algorithm.</p></div>
<div class="refsynopsisdiv"><h3 class="title">Calling Sequence</h3>
<div class="synopsis"><pre><span class="default">Y</span><span class="default"> = </span><span class="functionid">fftn</span><span class="default">(</span><span class="default">A</span><span class="default">)</span>
<span class="default">Y</span><span class="default"> = </span><span class="functionid">fftn</span><span class="default">(</span><span class="default">A</span><span class="default">, </span><span class="default">size</span><span class="default">)</span></pre></div></div>
<div class="refsection"><h3 class="title">Parameters</h3>
<dl><dt><span class="term">A:</span>
<dd><p class="para">Matrix</p></dd></dt></dl></div>
<div class="refsection"><h3 class="title">Description</h3>
<p class="para">This function computes the N-dimensional discrete Fourier transform of A using a Fast Fourier Transform (FFT) algorithm. The optional vector argument SIZE may be used specify the dimensions of the array to be used. If an element of SIZE is smaller than the corresponding dimension of A, then the dimension of A is truncated prior to performing the FFT. Otherwise, if an element of SIZE is larger than the corresponding dimension then A is resized and padded with zeros.</p></div>
<div class="refsection"><h3 class="title">Examples</h3>
<div class="programlisting"><table border="0" width="100%"><tr><td width="98%"><pre class="scilabcode"><span class="scilabid">fftn</span><span class="scilabopenclose">(</span><span class="scilabopenclose">[</span><span class="scilabnumber">2</span><span class="scilabdefault">,</span><span class="scilabnumber">3</span><span class="scilabdefault">,</span><span class="scilabnumber">4</span><span class="scilabopenclose">]</span><span class="scilabopenclose">)</span>
<span class="scilabid">ans</span> <span class="scilaboperator">=</span>
<span class="scilabnumber">9.</span> <span class="scilaboperator">-</span> <span class="scilabnumber">1.5</span> <span class="scilaboperator">+</span> <span class="scilabnumber">0.8660254</span><span class="scilabid">i</span> <span class="scilaboperator">-</span> <span class="scilabnumber">1.5</span> <span class="scilaboperator">-</span> <span class="scilabnumber">0.8660254</span><span class="scilabid">i</span></pre></td><td valign="top"><a href="scilab://scilab.execexample/"><img src="ScilabExecute.png" border="0"/></a></td><td valign="top"><a href="scilab://scilab.editexample/"><img src="ScilabEdit.png" border="0"/></a></td><td></td></tr></table></div></div>
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