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Add FFTW3
author Chris Cannam <cannam@all-day-breakfast.com>
date Wed, 20 Mar 2013 15:35:50 +0000
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cannam@95 3 <title>Wisdom File Export/Import from Fortran - FFTW 3.3.3</title>
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cannam@95 13 This manual is for FFTW
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cannam@95 49 <a name="Wisdom-File-Export%2fImport-from-Fortran"></a>
cannam@95 50 <a name="Wisdom-File-Export_002fImport-from-Fortran"></a>
cannam@95 51 <p>
cannam@95 52 Next:&nbsp;<a rel="next" accesskey="n" href="Wisdom-String-Export_002fImport-from-Fortran.html#Wisdom-String-Export_002fImport-from-Fortran">Wisdom String Export/Import from Fortran</a>,
cannam@95 53 Previous:&nbsp;<a rel="previous" accesskey="p" href="Accessing-the-wisdom-API-from-Fortran.html#Accessing-the-wisdom-API-from-Fortran">Accessing the wisdom API from Fortran</a>,
cannam@95 54 Up:&nbsp;<a rel="up" accesskey="u" href="Accessing-the-wisdom-API-from-Fortran.html#Accessing-the-wisdom-API-from-Fortran">Accessing the wisdom API from Fortran</a>
cannam@95 55 <hr>
cannam@95 56 </div>
cannam@95 57
cannam@95 58 <h4 class="subsection">7.6.1 Wisdom File Export/Import from Fortran</h4>
cannam@95 59
cannam@95 60 <p><a name="index-fftw_005fimport-wisdom_005ffrom_005ffilename-566"></a><a name="index-fftw_005fexport_005fwisdom_005fto_005ffilename-567"></a>The easiest way to export and import wisdom is to do so using
cannam@95 61 <code>fftw_export_wisdom_to_filename</code> and
cannam@95 62 <code>fftw_wisdom_from_filename</code>. The only trick is that these
cannam@95 63 require you to pass a C string, which is an array of type
cannam@95 64 <code>CHARACTER(C_CHAR)</code> that is terminated by <code>C_NULL_CHAR</code>.
cannam@95 65 You can call them like this:
cannam@95 66
cannam@95 67 <pre class="example"> integer(C_INT) :: ret
cannam@95 68 ret = fftw_export_wisdom_to_filename(C_CHAR_'my_wisdom.dat' // C_NULL_CHAR)
cannam@95 69 if (ret .eq. 0) stop 'error exporting wisdom to file'
cannam@95 70 ret = fftw_import_wisdom_from_filename(C_CHAR_'my_wisdom.dat' // C_NULL_CHAR)
cannam@95 71 if (ret .eq. 0) stop 'error importing wisdom from file'
cannam@95 72 </pre>
cannam@95 73 <p>Note that prepending &lsquo;<samp><span class="samp">C_CHAR_</span></samp>&rsquo; is needed to specify that the
cannam@95 74 literal string is of kind <code>C_CHAR</code>, and we null-terminate the
cannam@95 75 string by appending &lsquo;<samp><span class="samp">// C_NULL_CHAR</span></samp>&rsquo;. These functions return an
cannam@95 76 <code>integer(C_INT)</code> (<code>ret</code>) which is <code>0</code> if an error
cannam@95 77 occurred during export/import and nonzero otherwise.
cannam@95 78
cannam@95 79 <p>It is also possible to use the lower-level routines
cannam@95 80 <code>fftw_export_wisdom_to_file</code> and
cannam@95 81 <code>fftw_import_wisdom_from_file</code>, which accept parameters of the C
cannam@95 82 type <code>FILE*</code>, expressed in Fortran as <code>type(C_PTR)</code>.
cannam@95 83 However, you are then responsible for creating the <code>FILE*</code>
cannam@95 84 yourself. You can do this by using <code>iso_c_binding</code> to define
cannam@95 85 Fortran intefaces for the C library functions <code>fopen</code> and
cannam@95 86 <code>fclose</code>, which is a bit strange in Fortran but workable.
cannam@95 87
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