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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>FFTW Constants in Fortran - FFTW 3.2.1</title> | |
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| 13 This manual is for FFTW | |
| 14 (version 3.2.1, 5 February 2009). | |
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| 16 Copyright (C) 2003 Matteo Frigo. | |
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| 18 Copyright (C) 2003 Massachusetts Institute of Technology. | |
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| 49 <p> | |
| 50 <a name="FFTW-Constants-in-Fortran"></a> | |
| 51 Next: <a rel="next" accesskey="n" href="FFTW-Execution-in-Fortran.html#FFTW-Execution-in-Fortran">FFTW Execution in Fortran</a>, | |
| 52 Previous: <a rel="previous" accesskey="p" href="Fortran_002dinterface-routines.html#Fortran_002dinterface-routines">Fortran-interface routines</a>, | |
| 53 Up: <a rel="up" accesskey="u" href="Calling-FFTW-from-Fortran.html#Calling-FFTW-from-Fortran">Calling FFTW from Fortran</a> | |
| 54 <hr> | |
| 55 </div> | |
| 56 | |
| 57 <h3 class="section">7.2 FFTW Constants in Fortran</h3> | |
| 58 | |
| 59 <p>When creating plans in FFTW, a number of constants are used to specify | |
| 60 options, such as <code>FFTW_MEASURE</code> or <code>FFTW_ESTIMATE</code>. The | |
| 61 same constants must be used with the wrapper routines, but of course the | |
| 62 C header files where the constants are defined can't be incorporated | |
| 63 directly into Fortran code. | |
| 64 | |
| 65 <p>Instead, we have placed Fortran equivalents of the FFTW constant | |
| 66 definitions in the file <code>fftw3.f</code>, which can be found in the same | |
| 67 directory as <code>fftw3.h</code>. If your Fortran compiler supports a | |
| 68 preprocessor of some sort, you should be able to <code>include</code> or | |
| 69 <code>#include</code> this file; otherwise, you can paste it directly into | |
| 70 your code. | |
| 71 | |
| 72 <p><a name="index-flags-337"></a>In C, you combine different flags (like <code>FFTW_PRESERVE_INPUT</code> and | |
| 73 <code>FFTW_MEASURE</code>) using the `<samp><code>|</code></samp>' operator; in Fortran you | |
| 74 should just use `<samp><code>+</code></samp>'. (Take care not to add in the same flag | |
| 75 more than once, though.) | |
| 76 | |
| 77 <!-- --> | |
| 78 </body></html> | |
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