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diff --git a/help/en_US/scilab_en_US_help/fftshift1.html b/help/en_US/scilab_en_US_help/fftshift1.html new file mode 100644 index 0000000..bbd9360 --- /dev/null +++ b/help/en_US/scilab_en_US_help/fftshift1.html @@ -0,0 +1,79 @@ +<html><head> + <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> + <title>fftshift1</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"); + </style> + </head> + <body> + <div class="manualnavbar"> + <table width="100%"><tr> + <td width="30%"> + <span class="previous"><a href="fftn.html"><< fftn</a></span> + + </td> + <td width="40%" class="center"> + <span class="top"><a href="section_cc2bc01c47967d47fcf3507a91d572ba.html">FOSSEE Signal Processing Toolbox</a></span> + + </td> + <td width="30%" class="next"> + <span class="next"><a href="fftw1.html">fftw1 >></a></span> + + </td> + </tr></table> + <hr /> + </div> + + + + <span class="path"><a href="index.html">FOSSEE Signal Processing Toolbox</a> >> <a href="section_cc2bc01c47967d47fcf3507a91d572ba.html">FOSSEE Signal Processing Toolbox</a> > fftshift1</span> + + <br /><br /> + <div class="refnamediv"><h1 class="refname">fftshift1</h1> + <p class="refpurpose">Perform a shift of the vector X, for use with the 'fft1' and 'ifft1' functions, in order the move the frequency 0 to the center of the vector or matrix.</p></div> + + +<div class="refsynopsisdiv"><h3 class="title">Calling Sequence</h3> + <div class="synopsis"><pre><span class="functionid">fftshift1</span><span class="default"> (</span><span class="default">X</span><span class="default">)</span> +<span class="functionid">fftshift1</span><span class="default"> (</span><span class="default">X</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">X:</span> + <dd><p class="para">It is a vector of N elements corresponding to time samples</p></dd></dt> + <dt><span class="term">DIM:</span> + <dd><p class="para">The optional DIM argument can be used to limit the dimension along which the permutation occurs</p></dd></dt></dl></div> + +<div class="refsection"><h3 class="title">Description</h3> + <p class="para">This is an Octave function. +Perform a shift of the vector X, for use with the 'fft1' and 'ifft1' functions, in order the move the frequency 0 to the center of the vector or matrix.</p> + <p class="para">If X is a vector of N elements corresponding to N time samples spaced by dt, then 'fftshift1 (fft1 (X))' corresponds to frequencies</p> + <p class="para">f = [ -(ceil((N-1)/2):-1:1)*df 0 (1:floor((N-1)/2))*df ]</p> + <p class="para">where df = 1 / dt.</p> + <p class="para">If X is a matrix, the same holds for rows and columns. If X is an array, then the same holds along each dimension.</p> + <p class="para">The optional DIM argument can be used to limit the dimension along</p></div> + <br /> + + <div class="manualnavbar"> + <table width="100%"> + <tr><td colspan="3" class="next"><a href="http://bugzilla.scilab.org/enter_bug.cgi?product=Scilab%20software&component=Documentation%20pages" class="ulink">Report an issue</a></td></tr> +<tr> + <td width="30%"> + <span class="previous"><a href="fftn.html"><< fftn</a></span> + + </td> + <td width="40%" class="center"> + <span class="top"><a href="section_cc2bc01c47967d47fcf3507a91d572ba.html">FOSSEE Signal Processing Toolbox</a></span> + + </td> + <td width="30%" class="next"> + <span class="next"><a href="fftw1.html">fftw1 >></a></span> + + </td> + </tr></table> + <hr /> + </div> + </body> +</html> |