Mercurial > hg > sv-dependency-builds

annotate src/fftw-3.3.8/doc/html/FFTW-Constants-in-Fortran.html @ 83:ae30d91d2ffe

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Replace these with versions built using an older toolset (so as to avoid ABI compatibilities when linking on Ubuntu 14.04 for packaging purposes)
author Chris Cannam
date Fri, 07 Feb 2020 11:51:13 +0000
parents d0c2a83c1364
children
rev   line source
Chris@82 1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
Chris@82 2 <html>
Chris@82 3 <!-- This manual is for FFTW
Chris@82 4 (version 3.3.8, 24 May 2018).
Chris@82 5
Chris@82 6 Copyright (C) 2003 Matteo Frigo.
Chris@82 7
Chris@82 8 Copyright (C) 2003 Massachusetts Institute of Technology.
Chris@82 9
Chris@82 10 Permission is granted to make and distribute verbatim copies of this
Chris@82 11 manual provided the copyright notice and this permission notice are
Chris@82 12 preserved on all copies.
Chris@82 13
Chris@82 14 Permission is granted to copy and distribute modified versions of this
Chris@82 15 manual under the conditions for verbatim copying, provided that the
Chris@82 16 entire resulting derived work is distributed under the terms of a
Chris@82 17 permission notice identical to this one.
Chris@82 18
Chris@82 19 Permission is granted to copy and distribute translations of this manual
Chris@82 20 into another language, under the above conditions for modified versions,
Chris@82 21 except that this permission notice may be stated in a translation
Chris@82 22 approved by the Free Software Foundation. -->
Chris@82 23 <!-- Created by GNU Texinfo 6.3, http://www.gnu.org/software/texinfo/ -->
Chris@82 24 <head>
Chris@82 25 <title>FFTW 3.3.8: FFTW Constants in Fortran</title>
Chris@82 26
Chris@82 27 <meta name="description" content="FFTW 3.3.8: FFTW Constants in Fortran">
Chris@82 28 <meta name="keywords" content="FFTW 3.3.8: FFTW Constants in Fortran">
Chris@82 29 <meta name="resource-type" content="document">
Chris@82 30 <meta name="distribution" content="global">
Chris@82 31 <meta name="Generator" content="makeinfo">
Chris@82 32 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
Chris@82 33 <link href="index.html#Top" rel="start" title="Top">
Chris@82 34 <link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
Chris@82 35 <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
Chris@82 36 <link href="Calling-FFTW-from-Legacy-Fortran.html#Calling-FFTW-from-Legacy-Fortran" rel="up" title="Calling FFTW from Legacy Fortran">
Chris@82 37 <link href="FFTW-Execution-in-Fortran.html#FFTW-Execution-in-Fortran" rel="next" title="FFTW Execution in Fortran">
Chris@82 38 <link href="Fortran_002dinterface-routines.html#Fortran_002dinterface-routines" rel="prev" title="Fortran-interface routines">
Chris@82 39 <style type="text/css">
Chris@82 40 <!--
Chris@82 41 a.summary-letter {text-decoration: none}
Chris@82 42 blockquote.indentedblock {margin-right: 0em}
Chris@82 43 blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
Chris@82 44 blockquote.smallquotation {font-size: smaller}
Chris@82 45 div.display {margin-left: 3.2em}
Chris@82 46 div.example {margin-left: 3.2em}
Chris@82 47 div.lisp {margin-left: 3.2em}
Chris@82 48 div.smalldisplay {margin-left: 3.2em}
Chris@82 49 div.smallexample {margin-left: 3.2em}
Chris@82 50 div.smalllisp {margin-left: 3.2em}
Chris@82 51 kbd {font-style: oblique}
Chris@82 52 pre.display {font-family: inherit}
Chris@82 53 pre.format {font-family: inherit}
Chris@82 54 pre.menu-comment {font-family: serif}
Chris@82 55 pre.menu-preformatted {font-family: serif}
Chris@82 56 pre.smalldisplay {font-family: inherit; font-size: smaller}
Chris@82 57 pre.smallexample {font-size: smaller}
Chris@82 58 pre.smallformat {font-family: inherit; font-size: smaller}
Chris@82 59 pre.smalllisp {font-size: smaller}
Chris@82 60 span.nolinebreak {white-space: nowrap}
Chris@82 61 span.roman {font-family: initial; font-weight: normal}
Chris@82 62 span.sansserif {font-family: sans-serif; font-weight: normal}
Chris@82 63 ul.no-bullet {list-style: none}
Chris@82 64 -->
Chris@82 65 </style>
Chris@82 66
Chris@82 67
Chris@82 68 </head>
Chris@82 69
Chris@82 70 <body lang="en">
Chris@82 71 <a name="FFTW-Constants-in-Fortran"></a>
Chris@82 72 <div class="header">
Chris@82 73 <p>
Chris@82 74 Next: <a href="FFTW-Execution-in-Fortran.html#FFTW-Execution-in-Fortran" accesskey="n" rel="next">FFTW Execution in Fortran</a>, Previous: <a href="Fortran_002dinterface-routines.html#Fortran_002dinterface-routines" accesskey="p" rel="prev">Fortran-interface routines</a>, Up: <a href="Calling-FFTW-from-Legacy-Fortran.html#Calling-FFTW-from-Legacy-Fortran" accesskey="u" rel="up">Calling FFTW from Legacy Fortran</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
Chris@82 75 </div>
Chris@82 76 <hr>
Chris@82 77 <a name="FFTW-Constants-in-Fortran-1"></a>
Chris@82 78 <h3 class="section">8.2 FFTW Constants in Fortran</h3>
Chris@82 79
Chris@82 80 <p>When creating plans in FFTW, a number of constants are used to specify
Chris@82 81 options, such as <code>FFTW_MEASURE</code> or <code>FFTW_ESTIMATE</code>. The
Chris@82 82 same constants must be used with the wrapper routines, but of course the
Chris@82 83 C header files where the constants are defined can&rsquo;t be incorporated
Chris@82 84 directly into Fortran code.
Chris@82 85 </p>
Chris@82 86 <p>Instead, we have placed Fortran equivalents of the FFTW constant
Chris@82 87 definitions in the file <code>fftw3.f</code>, which can be found in the same
Chris@82 88 directory as <code>fftw3.h</code>. If your Fortran compiler supports a
Chris@82 89 preprocessor of some sort, you should be able to <code>include</code> or
Chris@82 90 <code>#include</code> this file; otherwise, you can paste it directly into
Chris@82 91 your code.
Chris@82 92 </p>
Chris@82 93 <a name="index-flags-9"></a>
Chris@82 94 <p>In C, you combine different flags (like <code>FFTW_PRESERVE_INPUT</code> and
Chris@82 95 <code>FFTW_MEASURE</code>) using the &lsquo;<samp><code>|</code></samp>&rsquo; operator; in Fortran
Chris@82 96 you should just use &lsquo;<samp><code>+</code></samp>&rsquo;. (Take care not to add in the
Chris@82 97 same flag more than once, though. Alternatively, you can use the
Chris@82 98 <code>ior</code> intrinsic function standardized in Fortran 95.)
Chris@82 99 </p>
Chris@82 100
Chris@82 101
Chris@82 102
Chris@82 103 </body>
Chris@82 104 </html>