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Add FFTW 3.3.8 source, and a Linux build
author Chris Cannam <cannam@all-day-breakfast.com>
date Tue, 19 Nov 2019 14:52:55 +0000
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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
4 (version 3.3.8, 24 May 2018).
5
6 Copyright (C) 2003 Matteo Frigo.
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8 Copyright (C) 2003 Massachusetts Institute of Technology.
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23 <!-- Created by GNU Texinfo 6.3, http://www.gnu.org/software/texinfo/ -->
24 <head>
25 <title>FFTW 3.3.8: Wisdom File Export/Import from Fortran</title>
26
27 <meta name="description" content="FFTW 3.3.8: Wisdom File Export/Import from Fortran">
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35 <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
36 <link href="Accessing-the-wisdom-API-from-Fortran.html#Accessing-the-wisdom-API-from-Fortran" rel="up" title="Accessing the wisdom API from Fortran">
37 <link href="Wisdom-String-Export_002fImport-from-Fortran.html#Wisdom-String-Export_002fImport-from-Fortran" rel="next" title="Wisdom String Export/Import from Fortran">
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71 <a name="Wisdom-File-Export_002fImport-from-Fortran"></a>
72 <div class="header">
73 <p>
74 Next: <a href="Wisdom-String-Export_002fImport-from-Fortran.html#Wisdom-String-Export_002fImport-from-Fortran" accesskey="n" rel="next">Wisdom String Export/Import from Fortran</a>, Previous: <a href="Accessing-the-wisdom-API-from-Fortran.html#Accessing-the-wisdom-API-from-Fortran" accesskey="p" rel="prev">Accessing the wisdom API from Fortran</a>, Up: <a href="Accessing-the-wisdom-API-from-Fortran.html#Accessing-the-wisdom-API-from-Fortran" accesskey="u" rel="up">Accessing the wisdom API from 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>
75 </div>
76 <hr>
77 <a name="Wisdom-File-Export_002fImport-from-Fortran-1"></a>
78 <h4 class="subsection">7.6.1 Wisdom File Export/Import from Fortran</h4>
79
80 <a name="index-fftw_005fimport-wisdom_005ffrom_005ffilename"></a>
81 <a name="index-fftw_005fexport_005fwisdom_005fto_005ffilename-2"></a>
82 <p>The easiest way to export and import wisdom is to do so using
83 <code>fftw_export_wisdom_to_filename</code> and
84 <code>fftw_wisdom_from_filename</code>. The only trick is that these
85 require you to pass a C string, which is an array of type
86 <code>CHARACTER(C_CHAR)</code> that is terminated by <code>C_NULL_CHAR</code>.
87 You can call them like this:
88 </p>
89 <div class="example">
90 <pre class="example"> integer(C_INT) :: ret
91 ret = fftw_export_wisdom_to_filename(C_CHAR_'my_wisdom.dat' // C_NULL_CHAR)
92 if (ret .eq. 0) stop 'error exporting wisdom to file'
93 ret = fftw_import_wisdom_from_filename(C_CHAR_'my_wisdom.dat' // C_NULL_CHAR)
94 if (ret .eq. 0) stop 'error importing wisdom from file'
95 </pre></div>
96
97 <p>Note that prepending &lsquo;<samp>C_CHAR_</samp>&rsquo; is needed to specify that the
98 literal string is of kind <code>C_CHAR</code>, and we null-terminate the
99 string by appending &lsquo;<samp>// C_NULL_CHAR</samp>&rsquo;. These functions return an
100 <code>integer(C_INT)</code> (<code>ret</code>) which is <code>0</code> if an error
101 occurred during export/import and nonzero otherwise.
102 </p>
103 <p>It is also possible to use the lower-level routines
104 <code>fftw_export_wisdom_to_file</code> and
105 <code>fftw_import_wisdom_from_file</code>, which accept parameters of the C
106 type <code>FILE*</code>, expressed in Fortran as <code>type(C_PTR)</code>.
107 However, you are then responsible for creating the <code>FILE*</code>
108 yourself. You can do this by using <code>iso_c_binding</code> to define
109 Fortran intefaces for the C library functions <code>fopen</code> and
110 <code>fclose</code>, which is a bit strange in Fortran but workable.
111 </p>
112
113
114
115 </body>
116 </html>