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Current fftw source
author Chris Cannam <cannam@all-day-breakfast.com>
date Tue, 18 Oct 2016 13:40:26 +0100
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cannam@127 3 <!-- This manual is for FFTW
cannam@127 4 (version 3.3.5, 30 July 2016).
cannam@127 5
cannam@127 6 Copyright (C) 2003 Matteo Frigo.
cannam@127 7
cannam@127 8 Copyright (C) 2003 Massachusetts Institute of Technology.
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cannam@127 10 Permission is granted to make and distribute verbatim copies of this
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cannam@127 24 <head>
cannam@127 25 <title>FFTW 3.3.5: Calling FFTW from Legacy Fortran</title>
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cannam@127 69 </head>
cannam@127 70
cannam@127 71 <body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
cannam@127 72 <a name="Calling-FFTW-from-Legacy-Fortran"></a>
cannam@127 73 <div class="header">
cannam@127 74 <p>
cannam@127 75 Next: <a href="Upgrading-from-FFTW-version-2.html#Upgrading-from-FFTW-version-2" accesskey="n" rel="next">Upgrading from FFTW version 2</a>, Previous: <a href="Calling-FFTW-from-Modern-Fortran.html#Calling-FFTW-from-Modern-Fortran" accesskey="p" rel="prev">Calling FFTW from Modern Fortran</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</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>
cannam@127 76 </div>
cannam@127 77 <hr>
cannam@127 78 <a name="Calling-FFTW-from-Legacy-Fortran-1"></a>
cannam@127 79 <h2 class="chapter">8 Calling FFTW from Legacy Fortran</h2>
cannam@127 80 <a name="index-Fortran-interface-3"></a>
cannam@127 81
cannam@127 82 <p>This chapter describes the interface to FFTW callable by Fortran code
cannam@127 83 in older compilers not supporting the Fortran 2003 C interoperability
cannam@127 84 features (see <a href="Calling-FFTW-from-Modern-Fortran.html#Calling-FFTW-from-Modern-Fortran">Calling FFTW from Modern Fortran</a>). This interface
cannam@127 85 has the major disadvantage that it is not type-checked, so if you
cannam@127 86 mistake the argument types or ordering then your program will not have
cannam@127 87 any compiler errors, and will likely crash at runtime. So, greater
cannam@127 88 care is needed. Also, technically interfacing older Fortran versions
cannam@127 89 to C is nonstandard, but in practice we have found that the techniques
cannam@127 90 used in this chapter have worked with all known Fortran compilers for
cannam@127 91 many years.
cannam@127 92 </p>
cannam@127 93 <p>The legacy Fortran interface differs from the C interface only in the
cannam@127 94 prefix (&lsquo;<samp>dfftw_</samp>&rsquo; instead of &lsquo;<samp>fftw_</samp>&rsquo; in double precision) and
cannam@127 95 a few other minor details. This Fortran interface is included in the
cannam@127 96 FFTW libraries by default, unless a Fortran compiler isn&rsquo;t found on
cannam@127 97 your system or <code>--disable-fortran</code> is included in the
cannam@127 98 <code>configure</code> flags. We assume here that the reader is already
cannam@127 99 familiar with the usage of FFTW in C, as described elsewhere in this
cannam@127 100 manual.
cannam@127 101 </p>
cannam@127 102 <p>The MPI parallel interface to FFTW is <em>not</em> currently available
cannam@127 103 to legacy Fortran.
cannam@127 104 </p>
cannam@127 105 <table class="menu" border="0" cellspacing="0">
cannam@127 106 <tr><td align="left" valign="top">&bull; <a href="Fortran_002dinterface-routines.html#Fortran_002dinterface-routines" accesskey="1">Fortran-interface routines</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
cannam@127 107 </td></tr>
cannam@127 108 <tr><td align="left" valign="top">&bull; <a href="FFTW-Constants-in-Fortran.html#FFTW-Constants-in-Fortran" accesskey="2">FFTW Constants in Fortran</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
cannam@127 109 </td></tr>
cannam@127 110 <tr><td align="left" valign="top">&bull; <a href="FFTW-Execution-in-Fortran.html#FFTW-Execution-in-Fortran" accesskey="3">FFTW Execution in Fortran</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
cannam@127 111 </td></tr>
cannam@127 112 <tr><td align="left" valign="top">&bull; <a href="Fortran-Examples.html#Fortran-Examples" accesskey="4">Fortran Examples</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
cannam@127 113 </td></tr>
cannam@127 114 <tr><td align="left" valign="top">&bull; <a href="Wisdom-of-Fortran_003f.html#Wisdom-of-Fortran_003f" accesskey="5">Wisdom of Fortran?</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
cannam@127 115 </td></tr>
cannam@127 116 </table>
cannam@127 117
cannam@127 118 <hr>
cannam@127 119 <div class="header">
cannam@127 120 <p>
cannam@127 121 Next: <a href="Upgrading-from-FFTW-version-2.html#Upgrading-from-FFTW-version-2" accesskey="n" rel="next">Upgrading from FFTW version 2</a>, Previous: <a href="Calling-FFTW-from-Modern-Fortran.html#Calling-FFTW-from-Modern-Fortran" accesskey="p" rel="prev">Calling FFTW from Modern Fortran</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</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>
cannam@127 122 </div>
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cannam@127 124
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