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2 <head>
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3 <title>Defining an FFTW module - 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-Modern-Fortran.html#Calling-FFTW-from-Modern-Fortran" title="Calling FFTW from Modern Fortran">
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9 <link rel="prev" href="Accessing-the-wisdom-API-from-Fortran.html#Accessing-the-wisdom-API-from-Fortran" title="Accessing the wisdom API from Fortran">
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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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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="Defining-an-FFTW-module"></a>
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49 <p>
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50 Previous: <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>,
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51 Up: <a rel="up" accesskey="u" href="Calling-FFTW-from-Modern-Fortran.html#Calling-FFTW-from-Modern-Fortran">Calling FFTW from Modern Fortran</a>
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52 <hr>
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53 </div>
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54
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55 <h3 class="section">7.7 Defining an FFTW module</h3>
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56
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57 <p>Rather than using the <code>include</code> statement to include the
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58 <code>fftw3.f03</code> interface file in any subroutine where you want to
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59 use FFTW, you might prefer to define an FFTW Fortran module. FFTW
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60 does not install itself as a module, primarily because
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61 <code>fftw3.f03</code> can be shared between different Fortran compilers while
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62 modules (in general) cannot. However, it is trivial to define your
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63 own FFTW module if you want. Just create a file containing:
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64
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65 <pre class="example"> module FFTW3
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66 use, intrinsic :: iso_c_binding
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67 include 'fftw3.f03'
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68 end module
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69 </pre>
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70 <p>Compile this file into a module as usual for your compiler (e.g. with
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71 <code>gfortran -c</code> you will get a file <code>fftw3.mod</code>). Now,
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72 instead of <code>include 'fftw3.f03'</code>, whenever you want to use FFTW
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73 routines you can just do:
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74
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75 <pre class="example"> use FFTW3
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76 </pre>
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77 <p>as usual for Fortran modules. (You still need to link to the FFTW
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78 library, of course.)
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79
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80 </body></html>
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81
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