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<span class="path"><a href="index.html">FOSSEE Signal Processing Toolbox</a> >> <a href="section_e54aa8aac34aa55341e8b4b782fe1a74.html">FOSSEE Signal Processing Toolbox</a> > fwht</span>
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<div class="refnamediv"><h1 class="refname">fwht</h1>
<p class="refpurpose">Compute the Walsh-Hadamard transform of x using the Fast Walsh-Hadamard Transform (FWHT) algorithm</p></div>
<div class="refsynopsisdiv"><h3 class="title">Calling Sequence</h3>
<div class="synopsis"><pre><span class="functionid">fwht</span><span class="default"> (</span><span class="default">x</span><span class="default">)</span>
<span class="functionid">fwht</span><span class="default"> (</span><span class="default">x</span><span class="default">, </span><span class="default">n</span><span class="default">)</span>
<span class="functionid">fwht</span><span class="default"> (</span><span class="default">x</span><span class="default">, </span><span class="default">n</span><span class="default">, </span><span class="default">order</span><span class="default">)</span></pre></div></div>
<div class="refsection"><h3 class="title">Parameters</h3>
<dl><dt><span class="term">x:</span>
<dd><p class="para">real or complex valued scalar or vector</p></dd></dt>
<dt><span class="term">n:</span>
<dd><p class="para">x is truncated or extended to have length n</p></dd></dt>
<dt><span class="term">order:</span>
<dd><p class="para">Specification of order in which coefficients should be arranged</p></dd></dt></dl></div>
<div class="refsection"><h3 class="title">Description</h3>
<p class="para">Compute the Walsh-Hadamard transform of x using the Fast Walsh-Hadamard Transform (FWHT) algorithm. If the input is a matrix, the FWHT is calculated along the columns of x.</p>
<p class="para">The number of elements of x must be a power of 2; if not, the input will be extended and filled with zeros. If a second argument is given, the input is truncated or extended to have length n.</p>
<p class="para">The third argument specifies the order in which the returned Walsh-Hadamard transform coefficients should be arranged. The order may be any of the following strings:</p>
<p class="para">"sequency"
The coefficients are returned in sequency order. This is the default if order is not given.</p>
<p class="para">"hadamard"
The coefficients are returned in Hadamard order.</p>
<p class="para">"dyadic"
The coefficients are returned in Gray code order.</p></div>
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