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Current fftw source
author Chris Cannam
date Tue, 18 Oct 2016 13:40:26 +0100
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Chris@42 3 <!-- This manual is for FFTW
Chris@42 4 (version 3.3.5, 30 July 2016).
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Chris@42 6 Copyright (C) 2003 Matteo Frigo.
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Chris@42 25 <title>FFTW 3.3.5: Defining an FFTW module</title>
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Chris@42 38 <link href="Wisdom-Generic-Export_002fImport-from-Fortran.html#Wisdom-Generic-Export_002fImport-from-Fortran" rel="prev" title="Wisdom Generic Export/Import from Fortran">
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Chris@42 72 <a name="Defining-an-FFTW-module"></a>
Chris@42 73 <div class="header">
Chris@42 74 <p>
Chris@42 75 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>
Chris@42 76 </div>
Chris@42 77 <hr>
Chris@42 78 <a name="Defining-an-FFTW-module-1"></a>
Chris@42 79 <h3 class="section">7.7 Defining an FFTW module</h3>
Chris@42 80
Chris@42 81 <p>Rather than using the <code>include</code> statement to include the
Chris@42 82 <code>fftw3.f03</code> interface file in any subroutine where you want to
Chris@42 83 use FFTW, you might prefer to define an FFTW Fortran module. FFTW
Chris@42 84 does not install itself as a module, primarily because
Chris@42 85 <code>fftw3.f03</code> can be shared between different Fortran compilers while
Chris@42 86 modules (in general) cannot. However, it is trivial to define your
Chris@42 87 own FFTW module if you want. Just create a file containing:
Chris@42 88 </p>
Chris@42 89 <div class="example">
Chris@42 90 <pre class="example"> module FFTW3
Chris@42 91 use, intrinsic :: iso_c_binding
Chris@42 92 include 'fftw3.f03'
Chris@42 93 end module
Chris@42 94 </pre></div>
Chris@42 95
Chris@42 96 <p>Compile this file into a module as usual for your compiler (e.g. with
Chris@42 97 <code>gfortran -c</code> you will get a file <code>fftw3.mod</code>). Now,
Chris@42 98 instead of <code>include 'fftw3.f03'</code>, whenever you want to use FFTW
Chris@42 99 routines you can just do:
Chris@42 100 </p>
Chris@42 101 <div class="example">
Chris@42 102 <pre class="example"> use FFTW3
Chris@42 103 </pre></div>
Chris@42 104
Chris@42 105 <p>as usual for Fortran modules. (You still need to link to the FFTW
Chris@42 106 library, of course.)
Chris@42 107 </p>
Chris@42 108
Chris@42 109
Chris@42 110 </body>
Chris@42 111 </html>