Mercurial > hg > sv-dependency-builds
diff src/fftw-3.3.3/doc/html/Interleaved-and-split-arrays.html @ 10:37bf6b4a2645
Add FFTW3
| author | Chris Cannam |
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| date | Wed, 20 Mar 2013 15:35:50 +0000 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/fftw-3.3.3/doc/html/Interleaved-and-split-arrays.html Wed Mar 20 15:35:50 2013 +0000 @@ -0,0 +1,81 @@ +<html lang="en"> +<head> +<title>Interleaved and split arrays - FFTW 3.3.3</title> +<meta http-equiv="Content-Type" content="text/html"> +<meta name="description" content="FFTW 3.3.3"> +<meta name="generator" content="makeinfo 4.13"> +<link title="Top" rel="start" href="index.html#Top"> +<link rel="up" href="Guru-Interface.html#Guru-Interface" title="Guru Interface"> +<link rel="prev" href="Guru-Interface.html#Guru-Interface" title="Guru Interface"> +<link rel="next" href="Guru-vector-and-transform-sizes.html#Guru-vector-and-transform-sizes" title="Guru vector and transform sizes"> +<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> +<!-- +This manual is for FFTW +(version 3.3.3, 25 November 2012). + +Copyright (C) 2003 Matteo Frigo. + +Copyright (C) 2003 Massachusetts Institute of Technology. + + Permission is granted to make and distribute verbatim copies of + this manual provided the copyright notice and this permission + notice are preserved on all copies. + + Permission is granted to copy and distribute modified versions of + this manual under the conditions for verbatim copying, provided + that the entire resulting derived work is distributed under the + terms of a permission notice identical to this one. + + Permission is granted to copy and distribute translations of this + manual into another language, under the above conditions for + modified versions, except that this permission notice may be + stated in a translation approved by the Free Software Foundation. + --> +<meta http-equiv="Content-Style-Type" content="text/css"> +<style type="text/css"><!-- + pre.display { font-family:inherit } + pre.format { font-family:inherit } + pre.smalldisplay { font-family:inherit; font-size:smaller } + pre.smallformat { font-family:inherit; font-size:smaller } + pre.smallexample { font-size:smaller } + pre.smalllisp { font-size:smaller } + span.sc { font-variant:small-caps } + span.roman { font-family:serif; font-weight:normal; } + span.sansserif { font-family:sans-serif; font-weight:normal; } +--></style> +</head> +<body> +<div class="node"> +<a name="Interleaved-and-split-arrays"></a> +<p> +Next: <a rel="next" accesskey="n" href="Guru-vector-and-transform-sizes.html#Guru-vector-and-transform-sizes">Guru vector and transform sizes</a>, +Previous: <a rel="previous" accesskey="p" href="Guru-Interface.html#Guru-Interface">Guru Interface</a>, +Up: <a rel="up" accesskey="u" href="Guru-Interface.html#Guru-Interface">Guru Interface</a> +<hr> +</div> + +<h4 class="subsection">4.5.1 Interleaved and split arrays</h4> + +<p>The guru interface supports two representations of complex numbers, +which we call the interleaved and the split format. + + <p>The <dfn>interleaved</dfn> format is the same one used by the basic and +advanced interfaces, and it is documented in <a href="Complex-numbers.html#Complex-numbers">Complex numbers</a>. +In the interleaved format, you provide pointers to the real part of a +complex number, and the imaginary part understood to be stored in the +next memory location. +<a name="index-interleaved-format-241"></a> + + <p>The <dfn>split</dfn> format allows separate pointers to the real and +imaginary parts of a complex array. +<a name="index-split-format-242"></a> + + <p>Technically, the interleaved format is redundant, because you can +always express an interleaved array in terms of a split array with +appropriate pointers and strides. On the other hand, the interleaved +format is simpler to use, and it is common in practice. Hence, FFTW +supports it as a special case. + +<!-- =========> --> + </body></html> +