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| author | Geogaddi\David <d.m.ronan@qmul.ac.uk> |
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| date | Thu, 09 Jul 2015 01:12:16 +0100 |
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| 1 <html lang="en"> | |
| 2 <head> | |
| 3 <title>Wisdom of Fortran? - FFTW 3.2.1</title> | |
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| 5 <meta name="description" content="FFTW 3.2.1"> | |
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| 8 <link rel="up" href="Calling-FFTW-from-Fortran.html#Calling-FFTW-from-Fortran" title="Calling FFTW from Fortran"> | |
| 9 <link rel="prev" href="Fortran-Examples.html#Fortran-Examples" title="Fortran Examples"> | |
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| 11 <!-- | |
| 12 This manual is for FFTW | |
| 13 (version 3.2.1, 5 February 2009). | |
| 14 | |
| 15 Copyright (C) 2003 Matteo Frigo. | |
| 16 | |
| 17 Copyright (C) 2003 Massachusetts Institute of Technology. | |
| 18 | |
| 19 Permission is granted to make and distribute verbatim copies of | |
| 20 this manual provided the copyright notice and this permission | |
| 21 notice are preserved on all copies. | |
| 22 | |
| 23 Permission is granted to copy and distribute modified versions of | |
| 24 this manual under the conditions for verbatim copying, provided | |
| 25 that the entire resulting derived work is distributed under the | |
| 26 terms of a permission notice identical to this one. | |
| 27 | |
| 28 Permission is granted to copy and distribute translations of this | |
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| 45 </head> | |
| 46 <body> | |
| 47 <div class="node"> | |
| 48 <p> | |
| 49 <a name="Wisdom-of-Fortran%3f"></a> | |
| 50 <a name="Wisdom-of-Fortran_003f"></a> | |
| 51 Previous: <a rel="previous" accesskey="p" href="Fortran-Examples.html#Fortran-Examples">Fortran Examples</a>, | |
| 52 Up: <a rel="up" accesskey="u" href="Calling-FFTW-from-Fortran.html#Calling-FFTW-from-Fortran">Calling FFTW from Fortran</a> | |
| 53 <hr> | |
| 54 </div> | |
| 55 | |
| 56 <h3 class="section">7.5 Wisdom of Fortran?</h3> | |
| 57 | |
| 58 <p>In this section, we discuss how one can import/export FFTW wisdom | |
| 59 (saved plans) to/from a Fortran program; we assume that the reader is | |
| 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>. | |
| 61 | |
| 62 <p><a name="index-portability-352"></a>The basic problem is that is difficult to (portably) pass files and | |
| 63 strings between Fortran and C, so we cannot provide a direct Fortran | |
| 64 equivalent to the <code>fftw_export_wisdom_to_file</code>, etcetera, | |
| 65 functions. Fortran interfaces <em>are</em> provided for the functions | |
| 66 that do not take file/string arguments, however: | |
| 67 <code>dfftw_import_system_wisdom</code>, <code>dfftw_import_wisdom</code>, | |
| 68 <code>dfftw_export_wisdom</code>, and <code>dfftw_forget_wisdom</code>. | |
| 69 <a name="index-dfftw_005fimport_005fsystem_005fwisdom-353"></a><a name="index-dfftw_005fimport_005fwisdom-354"></a><a name="index-dfftw_005fexport_005fwisdom-355"></a><a name="index-dfftw_005fforget_005fwisdom-356"></a> | |
| 70 So, for example, to import the system-wide wisdom, you would do: | |
| 71 | |
| 72 <pre class="example"> integer isuccess | |
| 73 call dfftw_import_system_wisdom(isuccess) | |
| 74 </pre> | |
| 75 <p>As usual, the C return value is turned into a first parameter; | |
| 76 <code>isuccess</code> is non-zero on success and zero on failure (e.g. if | |
| 77 there is no system wisdom installed). | |
| 78 | |
| 79 <p>If you want to import/export wisdom from/to an arbitrary file or | |
| 80 elsewhere, you can employ the generic <code>dfftw_import_wisdom</code> and | |
| 81 <code>dfftw_export_wisdom</code> functions, for which you must supply a | |
| 82 subroutine to read/write one character at a time. The FFTW package | |
| 83 contains an example file <code>doc/f77_wisdom.f</code> demonstrating how to | |
| 84 implement <code>import_wisdom_from_file</code> and | |
| 85 <code>export_wisdom_to_file</code> subroutines in this way. (These routines | |
| 86 cannot be compiled into the FFTW library itself, lest all FFTW-using | |
| 87 programs be required to link with the Fortran I/O library.) | |
| 88 | |
| 89 <!-- ************************************************************ --> | |
| 90 </body></html> | |
| 91 |