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Add FFTW3
author Chris Cannam
date Wed, 20 Mar 2013 15:35:50 +0000
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3 <title>Calling FFTW from Legacy Fortran - FFTW 3.3.3</title>
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55
56 <h2 class="chapter">8 Calling FFTW from Legacy Fortran</h2>
57
58 <p><a name="index-Fortran-interface-577"></a>
59 This chapter describes the interface to FFTW callable by Fortran code
60 in older compilers not supporting the Fortran 2003 C interoperability
61 features (see <a href="Calling-FFTW-from-Modern-Fortran.html#Calling-FFTW-from-Modern-Fortran">Calling FFTW from Modern Fortran</a>). This interface
62 has the major disadvantage that it is not type-checked, so if you
63 mistake the argument types or ordering then your program will not have
64 any compiler errors, and will likely crash at runtime. So, greater
65 care is needed. Also, technically interfacing older Fortran versions
66 to C is nonstandard, but in practice we have found that the techniques
67 used in this chapter have worked with all known Fortran compilers for
68 many years.
69
70 <p>The legacy Fortran interface differs from the C interface only in the
71 prefix (&lsquo;<samp><span class="samp">dfftw_</span></samp>&rsquo; instead of &lsquo;<samp><span class="samp">fftw_</span></samp>&rsquo; in double precision) and
72 a few other minor details. This Fortran interface is included in the
73 FFTW libraries by default, unless a Fortran compiler isn't found on
74 your system or <code>--disable-fortran</code> is included in the
75 <code>configure</code> flags. We assume here that the reader is already
76 familiar with the usage of FFTW in C, as described elsewhere in this
77 manual.
78
79 <p>The MPI parallel interface to FFTW is <em>not</em> currently available
80 to legacy Fortran.
81
82 <ul class="menu">
83 <li><a accesskey="1" href="Fortran_002dinterface-routines.html#Fortran_002dinterface-routines">Fortran-interface routines</a>
84 <li><a accesskey="2" href="FFTW-Constants-in-Fortran.html#FFTW-Constants-in-Fortran">FFTW Constants in Fortran</a>
85 <li><a accesskey="3" href="FFTW-Execution-in-Fortran.html#FFTW-Execution-in-Fortran">FFTW Execution in Fortran</a>
86 <li><a accesskey="4" href="Fortran-Examples.html#Fortran-Examples">Fortran Examples</a>
87 <li><a accesskey="5" href="Wisdom-of-Fortran_003f.html#Wisdom-of-Fortran_003f">Wisdom of Fortran?</a>
88 </ul>
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