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Add FFTW3
author Chris Cannam <cannam@all-day-breakfast.com>
date Wed, 20 Mar 2013 15:35:50 +0000
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1 <html lang="en">
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3 <title>Defining an FFTW module - FFTW 3.3.3</title>
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48 <a name="Defining-an-FFTW-module"></a>
49 <p>
50 Previous:&nbsp;<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>,
51 Up:&nbsp;<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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54
55 <h3 class="section">7.7 Defining an FFTW module</h3>
56
57 <p>Rather than using the <code>include</code> statement to include the
58 <code>fftw3.f03</code> interface file in any subroutine where you want to
59 use FFTW, you might prefer to define an FFTW Fortran module. FFTW
60 does not install itself as a module, primarily because
61 <code>fftw3.f03</code> can be shared between different Fortran compilers while
62 modules (in general) cannot. However, it is trivial to define your
63 own FFTW module if you want. Just create a file containing:
64
65 <pre class="example"> module FFTW3
66 use, intrinsic :: iso_c_binding
67 include 'fftw3.f03'
68 end module
69 </pre>
70 <p>Compile this file into a module as usual for your compiler (e.g. with
71 <code>gfortran -c</code> you will get a file <code>fftw3.mod</code>). Now,
72 instead of <code>include 'fftw3.f03'</code>, whenever you want to use FFTW
73 routines you can just do:
74
75 <pre class="example"> use FFTW3
76 </pre>
77 <p>as usual for Fortran modules. (You still need to link to the FFTW
78 library, of course.)
79
80 </body></html>
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