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1 <html lang="en">
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2 <head>
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3 <title>FFTW Constants in 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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6 <meta name="generator" content="makeinfo 4.13">
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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_002dinterface-routines.html#Fortran_002dinterface-routines" title="Fortran-interface routines">
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10 <link rel="next" href="FFTW-Execution-in-Fortran.html#FFTW-Execution-in-Fortran" title="FFTW Execution in Fortran">
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11 <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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12 <!--
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13 This manual is for FFTW
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14 (version 3.3.4, 20 September 2013).
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15
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16 Copyright (C) 2003 Matteo Frigo.
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17
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18 Copyright (C) 2003 Massachusetts Institute of Technology.
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19
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20 Permission is granted to make and distribute verbatim copies of
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21 this manual provided the copyright notice and this permission
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22 notice are preserved on all copies.
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23
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24 Permission is granted to copy and distribute modified versions of
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25 this manual under the conditions for verbatim copying, provided
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26 that the entire resulting derived work is distributed under the
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27 terms of a permission notice identical to this one.
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28
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29 Permission is granted to copy and distribute translations of this
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30 manual into another language, under the above conditions for
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31 modified versions, except that this permission notice may be
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32 stated in a translation approved by the Free Software Foundation.
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33 -->
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45 --></style>
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46 </head>
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47 <body>
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48 <div class="node">
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49 <a name="FFTW-Constants-in-Fortran"></a>
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50 <p>
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51 Next: <a rel="next" accesskey="n" href="FFTW-Execution-in-Fortran.html#FFTW-Execution-in-Fortran">FFTW Execution in Fortran</a>,
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52 Previous: <a rel="previous" accesskey="p" href="Fortran_002dinterface-routines.html#Fortran_002dinterface-routines">Fortran-interface routines</a>,
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53 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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54 <hr>
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55 </div>
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56
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57 <h3 class="section">8.2 FFTW Constants in Fortran</h3>
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58
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59 <p>When creating plans in FFTW, a number of constants are used to specify
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60 options, such as <code>FFTW_MEASURE</code> or <code>FFTW_ESTIMATE</code>. The
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61 same constants must be used with the wrapper routines, but of course the
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62 C header files where the constants are defined can't be incorporated
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63 directly into Fortran code.
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64
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65 <p>Instead, we have placed Fortran equivalents of the FFTW constant
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66 definitions in the file <code>fftw3.f</code>, which can be found in the same
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67 directory as <code>fftw3.h</code>. If your Fortran compiler supports a
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68 preprocessor of some sort, you should be able to <code>include</code> or
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69 <code>#include</code> this file; otherwise, you can paste it directly into
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70 your code.
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71
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72 <p><a name="index-flags-586"></a>In C, you combine different flags (like <code>FFTW_PRESERVE_INPUT</code> and
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73 <code>FFTW_MEASURE</code>) using the ‘<samp><code>|</code></samp>’ operator; in Fortran
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74 you should just use ‘<samp><code>+</code></samp>’. (Take care not to add in the
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75 same flag more than once, though. Alternatively, you can use the
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76 <code>ior</code> intrinsic function standardized in Fortran 95.)
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77
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78 <!-- -->
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79 </body></html>
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