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1 <html lang="en">
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2 <head>
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3 <title>Wisdom of Fortran? - FFTW 3.3.4</title>
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4 <meta http-equiv="Content-Type" content="text/html">
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5 <meta name="description" content="FFTW 3.3.4">
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7 <link title="Top" rel="start" href="index.html#Top">
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8 <link rel="up" href="Calling-FFTW-from-Legacy-Fortran.html#Calling-FFTW-from-Legacy-Fortran" title="Calling FFTW from Legacy Fortran">
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9 <link rel="prev" href="Fortran-Examples.html#Fortran-Examples" title="Fortran Examples">
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10 <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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11 <!--
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12 This manual is for FFTW
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13 (version 3.3.4, 20 September 2013).
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14
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15 Copyright (C) 2003 Matteo Frigo.
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16
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17 Copyright (C) 2003 Massachusetts Institute of Technology.
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18
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19 Permission is granted to make and distribute verbatim copies of
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20 this manual provided the copyright notice and this permission
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21 notice are preserved on all copies.
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22
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23 Permission is granted to copy and distribute modified versions of
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24 this manual under the conditions for verbatim copying, provided
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25 that the entire resulting derived work is distributed under the
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26 terms of a permission notice identical to this one.
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27
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28 Permission is granted to copy and distribute translations of this
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29 manual into another language, under the above conditions for
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30 modified versions, except that this permission notice may be
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31 stated in a translation approved by the Free Software Foundation.
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32 -->
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34 <style type="text/css"><!--
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44 --></style>
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45 </head>
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46 <body>
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47 <div class="node">
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48 <a name="Wisdom-of-Fortran%3f"></a>
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49 <a name="Wisdom-of-Fortran_003f"></a>
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50 <p>
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51 Previous: <a rel="previous" accesskey="p" href="Fortran-Examples.html#Fortran-Examples">Fortran Examples</a>,
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52 Up: <a rel="up" accesskey="u" href="Calling-FFTW-from-Legacy-Fortran.html#Calling-FFTW-from-Legacy-Fortran">Calling FFTW from Legacy Fortran</a>
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53 <hr>
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54 </div>
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55
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56 <h3 class="section">8.5 Wisdom of Fortran?</h3>
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57
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58 <p>In this section, we discuss how one can import/export FFTW wisdom
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59 (saved plans) to/from a Fortran program; we assume that the reader is
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60 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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61
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62 <p><a name="index-portability-601"></a>The basic problem is that is difficult to (portably) pass files and
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63 strings between Fortran and C, so we cannot provide a direct Fortran
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64 equivalent to the <code>fftw_export_wisdom_to_file</code>, etcetera,
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65 functions. Fortran interfaces <em>are</em> provided for the functions
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66 that do not take file/string arguments, however:
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67 <code>dfftw_import_system_wisdom</code>, <code>dfftw_import_wisdom</code>,
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68 <code>dfftw_export_wisdom</code>, and <code>dfftw_forget_wisdom</code>.
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69 <a name="index-dfftw_005fimport_005fsystem_005fwisdom-602"></a><a name="index-dfftw_005fimport_005fwisdom-603"></a><a name="index-dfftw_005fexport_005fwisdom-604"></a><a name="index-dfftw_005fforget_005fwisdom-605"></a>
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70
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71 <p>So, for example, to import the system-wide wisdom, you would do:
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72
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73 <pre class="example"> integer isuccess
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74 call dfftw_import_system_wisdom(isuccess)
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75 </pre>
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76 <p>As usual, the C return value is turned into a first parameter;
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77 <code>isuccess</code> is non-zero on success and zero on failure (e.g. if
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78 there is no system wisdom installed).
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79
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80 <p>If you want to import/export wisdom from/to an arbitrary file or
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81 elsewhere, you can employ the generic <code>dfftw_import_wisdom</code> and
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82 <code>dfftw_export_wisdom</code> functions, for which you must supply a
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83 subroutine to read/write one character at a time. The FFTW package
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84 contains an example file <code>doc/f77_wisdom.f</code> demonstrating how to
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85 implement <code>import_wisdom_from_file</code> and
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86 <code>export_wisdom_to_file</code> subroutines in this way. (These routines
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87 cannot be compiled into the FFTW library itself, lest all FFTW-using
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88 programs be required to link with the Fortran I/O library.)
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89
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90 </body></html>
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91
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