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1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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2 <html>
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3 <!-- This manual is for FFTW
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4 (version 3.3.5, 30 July 2016).
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5
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6 Copyright (C) 2003 Matteo Frigo.
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7
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8 Copyright (C) 2003 Massachusetts Institute of Technology.
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9
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10 Permission is granted to make and distribute verbatim copies of this
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11 manual provided the copyright notice and this permission notice are
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12 preserved on all copies.
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13
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14 Permission is granted to copy and distribute modified versions of this
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15 manual under the conditions for verbatim copying, provided that the
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16 entire resulting derived work is distributed under the terms of a
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17 permission notice identical to this one.
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18
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19 Permission is granted to copy and distribute translations of this manual
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20 into another language, under the above conditions for modified versions,
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21 except that this permission notice may be stated in a translation
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22 approved by the Free Software Foundation. -->
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23 <!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
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24 <head>
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25 <title>FFTW 3.3.5: Calling FFTW from Legacy Fortran</title>
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26
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27 <meta name="description" content="FFTW 3.3.5: Calling FFTW from Legacy Fortran">
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34 <link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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35 <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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36 <link href="index.html#Top" rel="up" title="Top">
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37 <link href="Fortran_002dinterface-routines.html#Fortran_002dinterface-routines" rel="next" title="Fortran-interface routines">
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38 <link href="Defining-an-FFTW-module.html#Defining-an-FFTW-module" rel="prev" title="Defining an FFTW module">
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65 -->
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66 </style>
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67
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68
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69 </head>
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70
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71 <body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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72 <a name="Calling-FFTW-from-Legacy-Fortran"></a>
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73 <div class="header">
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74 <p>
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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> [<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>
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76 </div>
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77 <hr>
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78 <a name="Calling-FFTW-from-Legacy-Fortran-1"></a>
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79 <h2 class="chapter">8 Calling FFTW from Legacy Fortran</h2>
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80 <a name="index-Fortran-interface-3"></a>
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81
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82 <p>This chapter describes the interface to FFTW callable by Fortran code
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83 in older compilers not supporting the Fortran 2003 C interoperability
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84 features (see <a href="Calling-FFTW-from-Modern-Fortran.html#Calling-FFTW-from-Modern-Fortran">Calling FFTW from Modern Fortran</a>). This interface
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85 has the major disadvantage that it is not type-checked, so if you
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86 mistake the argument types or ordering then your program will not have
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87 any compiler errors, and will likely crash at runtime. So, greater
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88 care is needed. Also, technically interfacing older Fortran versions
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89 to C is nonstandard, but in practice we have found that the techniques
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90 used in this chapter have worked with all known Fortran compilers for
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91 many years.
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92 </p>
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93 <p>The legacy Fortran interface differs from the C interface only in the
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94 prefix (‘<samp>dfftw_</samp>’ instead of ‘<samp>fftw_</samp>’ in double precision) and
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95 a few other minor details. This Fortran interface is included in the
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96 FFTW libraries by default, unless a Fortran compiler isn’t found on
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97 your system or <code>--disable-fortran</code> is included in the
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98 <code>configure</code> flags. We assume here that the reader is already
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99 familiar with the usage of FFTW in C, as described elsewhere in this
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100 manual.
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101 </p>
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102 <p>The MPI parallel interface to FFTW is <em>not</em> currently available
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103 to legacy Fortran.
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104 </p>
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105 <table class="menu" border="0" cellspacing="0">
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106 <tr><td align="left" valign="top">• <a href="Fortran_002dinterface-routines.html#Fortran_002dinterface-routines" accesskey="1">Fortran-interface routines</a>:</td><td> </td><td align="left" valign="top">
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107 </td></tr>
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108 <tr><td align="left" valign="top">• <a href="FFTW-Constants-in-Fortran.html#FFTW-Constants-in-Fortran" accesskey="2">FFTW Constants in Fortran</a>:</td><td> </td><td align="left" valign="top">
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109 </td></tr>
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110 <tr><td align="left" valign="top">• <a href="FFTW-Execution-in-Fortran.html#FFTW-Execution-in-Fortran" accesskey="3">FFTW Execution in Fortran</a>:</td><td> </td><td align="left" valign="top">
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111 </td></tr>
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112 <tr><td align="left" valign="top">• <a href="Fortran-Examples.html#Fortran-Examples" accesskey="4">Fortran Examples</a>:</td><td> </td><td align="left" valign="top">
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113 </td></tr>
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114 <tr><td align="left" valign="top">• <a href="Wisdom-of-Fortran_003f.html#Wisdom-of-Fortran_003f" accesskey="5">Wisdom of Fortran?</a>:</td><td> </td><td align="left" valign="top">
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115 </td></tr>
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116 </table>
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117
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118 <hr>
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119 <div class="header">
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120 <p>
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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> [<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>
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122 </div>
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123
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124
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125
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126 </body>
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127 </html>
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