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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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3 <!-- This manual is for FFTW
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4 (version 3.3.8, 24 May 2018).
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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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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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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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17 permission notice identical to this one.
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23 <!-- Created by GNU Texinfo 6.3, http://www.gnu.org/software/texinfo/ -->
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24 <head>
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25 <title>FFTW 3.3.8: Wisdom of Fortran?</title>
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26
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27 <meta name="description" content="FFTW 3.3.8: Wisdom of 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="Calling-FFTW-from-Legacy-Fortran.html#Calling-FFTW-from-Legacy-Fortran" rel="up" title="Calling FFTW from Legacy Fortran">
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37 <link href="Upgrading-from-FFTW-version-2.html#Upgrading-from-FFTW-version-2" rel="next" title="Upgrading from FFTW version 2">
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38 <link href="Fortran-Examples.html#Fortran-Examples" rel="prev" title="Fortran Examples">
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65 </style>
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66
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67
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68 </head>
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69
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70 <body lang="en">
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71 <a name="Wisdom-of-Fortran_003f"></a>
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72 <div class="header">
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73 <p>
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74 Previous: <a href="Fortran-Examples.html#Fortran-Examples" accesskey="p" rel="prev">Fortran Examples</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> [<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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75 </div>
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76 <hr>
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77 <a name="Wisdom-of-Fortran_003f-1"></a>
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78 <h3 class="section">8.5 Wisdom of Fortran?</h3>
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79
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80 <p>In this section, we discuss how one can import/export FFTW wisdom
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81 (saved plans) to/from a Fortran program; we assume that the reader is
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82 already familiar with wisdom, as described in <a href="Words-of-Wisdom_002dSaving-Plans.html#Words-of-Wisdom_002dSaving-Plans">Words of Wisdom-Saving Plans</a>.
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83 </p>
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84 <a name="index-portability-8"></a>
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85 <p>The basic problem is that is difficult to (portably) pass files and
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86 strings between Fortran and C, so we cannot provide a direct Fortran
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87 equivalent to the <code>fftw_export_wisdom_to_file</code>, etcetera,
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88 functions. Fortran interfaces <em>are</em> provided for the functions
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89 that do not take file/string arguments, however:
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90 <code>dfftw_import_system_wisdom</code>, <code>dfftw_import_wisdom</code>,
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91 <code>dfftw_export_wisdom</code>, and <code>dfftw_forget_wisdom</code>.
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92 <a name="index-dfftw_005fimport_005fsystem_005fwisdom"></a>
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93 <a name="index-dfftw_005fimport_005fwisdom"></a>
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94 <a name="index-dfftw_005fexport_005fwisdom"></a>
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95 <a name="index-dfftw_005fforget_005fwisdom"></a>
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96 </p>
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97
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98 <p>So, for example, to import the system-wide wisdom, you would do:
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99 </p>
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100 <div class="example">
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101 <pre class="example"> integer isuccess
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102 call dfftw_import_system_wisdom(isuccess)
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103 </pre></div>
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104
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105 <p>As usual, the C return value is turned into a first parameter;
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106 <code>isuccess</code> is non-zero on success and zero on failure (e.g. if
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107 there is no system wisdom installed).
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108 </p>
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109 <p>If you want to import/export wisdom from/to an arbitrary file or
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110 elsewhere, you can employ the generic <code>dfftw_import_wisdom</code> and
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111 <code>dfftw_export_wisdom</code> functions, for which you must supply a
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112 subroutine to read/write one character at a time. The FFTW package
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113 contains an example file <code>doc/f77_wisdom.f</code> demonstrating how to
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114 implement <code>import_wisdom_from_file</code> and
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115 <code>export_wisdom_to_file</code> subroutines in this way. (These routines
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116 cannot be compiled into the FFTW library itself, lest all FFTW-using
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117 programs be required to link with the Fortran I/O library.)
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118 </p>
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119
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120
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121 </body>
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122 </html>
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