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Add FFTW 3.3.8 source, and a Linux build
author Chris Cannam <cannam@all-day-breakfast.com>
date Tue, 19 Nov 2019 14:52:55 +0000
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3 <!-- This manual is for FFTW
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6 Copyright (C) 2003 Matteo Frigo.
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71 <a name="Defining-an-FFTW-module"></a>
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73 <p>
74 Previous: <a href="Accessing-the-wisdom-API-from-Fortran.html#Accessing-the-wisdom-API-from-Fortran" accesskey="p" rel="prev">Accessing the wisdom API from Fortran</a>, Up: <a href="Calling-FFTW-from-Modern-Fortran.html#Calling-FFTW-from-Modern-Fortran" accesskey="u" rel="up">Calling FFTW from Modern Fortran</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
75 </div>
76 <hr>
77 <a name="Defining-an-FFTW-module-1"></a>
78 <h3 class="section">7.7 Defining an FFTW module</h3>
79
80 <p>Rather than using the <code>include</code> statement to include the
81 <code>fftw3.f03</code> interface file in any subroutine where you want to
82 use FFTW, you might prefer to define an FFTW Fortran module. FFTW
83 does not install itself as a module, primarily because
84 <code>fftw3.f03</code> can be shared between different Fortran compilers while
85 modules (in general) cannot. However, it is trivial to define your
86 own FFTW module if you want. Just create a file containing:
87 </p>
88 <div class="example">
89 <pre class="example"> module FFTW3
90 use, intrinsic :: iso_c_binding
91 include 'fftw3.f03'
92 end module
93 </pre></div>
94
95 <p>Compile this file into a module as usual for your compiler (e.g. with
96 <code>gfortran -c</code> you will get a file <code>fftw3.mod</code>). Now,
97 instead of <code>include 'fftw3.f03'</code>, whenever you want to use FFTW
98 routines you can just do:
99 </p>
100 <div class="example">
101 <pre class="example"> use FFTW3
102 </pre></div>
103
104 <p>as usual for Fortran modules. (You still need to link to the FFTW
105 library, of course.)
106 </p>
107
108
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