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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> > ifht</span>
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<div class="refnamediv"><h1 class="refname">ifht</h1>
<p class="refpurpose">Calculate the inverse Fast Hartley Transform of real input D</p></div>
<div class="refsynopsisdiv"><h3 class="title">Calling Sequence</h3>
<div class="synopsis"><pre><span class="default">m</span><span class="default">= </span><span class="functionid">ifht</span><span class="default"> (</span><span class="default">d</span><span class="default">)</span>
<span class="default">m</span><span class="default">= </span><span class="functionid">ifht</span><span class="default"> (</span><span class="default">d</span><span class="default">,</span><span class="default">n</span><span class="default">)</span>
<span class="default">m</span><span class="default">= </span><span class="functionid">ifht</span><span class="default"> (</span><span class="default">d</span><span class="default">,</span><span class="default">n</span><span class="default">,</span><span class="default">dim</span><span class="default">)</span></pre></div></div>
<div class="refsection"><h3 class="title">Parameters</h3>
<dl><dt><span class="term">d:</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">Similar to the options of FFT function</p></dd></dt>
<dt><span class="term">dim:</span>
<dd><p class="para">Similar to the options of FFT function</p></dd></dt></dl></div>
<div class="refsection"><h3 class="title">Description</h3>
<p class="para">Calculate the inverse Fast Hartley Transform of real input d. If d is a matrix, the inverse Hartley transform is calculated along the columns by default. The options n and dim are similar to the options of FFT function.</p>
<p class="para">The forward and inverse Hartley transforms are the same (except for a scale factor of 1/N for the inverse hartley transform), but implemented using different functions.</p>
<p class="para">The definition of the forward hartley transform for vector d, m[K] = 1/N \sum_{i=0}^{N-1} d[i]*(cos[K*2*pi*i/N] + sin[K*2*pi*i/N]), for 0 <= K < N. m[K] = 1/N \sum_{i=0}^{N-1} d[i]*CAS[K*i], for 0 <= K < N.</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">ifht</span><span class="scilabopenclose">(</span><span class="scilabnumber">1</span> <span class="scilabspecial">:</span> <span class="scilabnumber">4</span><span class="scilabopenclose">)</span>
<span class="scilabid">ifht</span><span class="scilabopenclose">(</span><span class="scilabnumber">1</span><span class="scilabspecial">:</span><span class="scilabnumber">4</span><span class="scilabdefault">,</span> <span class="scilabnumber">2</span><span class="scilabopenclose">)</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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