|
Chris@19
|
1 <html lang="en">
|
|
Chris@19
|
2 <head>
|
|
Chris@19
|
3 <title>Calling FFTW from Legacy Fortran - FFTW 3.3.4</title>
|
|
Chris@19
|
4 <meta http-equiv="Content-Type" content="text/html">
|
|
Chris@19
|
5 <meta name="description" content="FFTW 3.3.4">
|
|
Chris@19
|
6 <meta name="generator" content="makeinfo 4.13">
|
|
Chris@19
|
7 <link title="Top" rel="start" href="index.html#Top">
|
|
Chris@19
|
8 <link rel="prev" href="Calling-FFTW-from-Modern-Fortran.html#Calling-FFTW-from-Modern-Fortran" title="Calling FFTW from Modern Fortran">
|
|
Chris@19
|
9 <link rel="next" href="Upgrading-from-FFTW-version-2.html#Upgrading-from-FFTW-version-2" title="Upgrading from FFTW version 2">
|
|
Chris@19
|
10 <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
|
|
Chris@19
|
11 <!--
|
|
Chris@19
|
12 This manual is for FFTW
|
|
Chris@19
|
13 (version 3.3.4, 20 September 2013).
|
|
Chris@19
|
14
|
|
Chris@19
|
15 Copyright (C) 2003 Matteo Frigo.
|
|
Chris@19
|
16
|
|
Chris@19
|
17 Copyright (C) 2003 Massachusetts Institute of Technology.
|
|
Chris@19
|
18
|
|
Chris@19
|
19 Permission is granted to make and distribute verbatim copies of
|
|
Chris@19
|
20 this manual provided the copyright notice and this permission
|
|
Chris@19
|
21 notice are preserved on all copies.
|
|
Chris@19
|
22
|
|
Chris@19
|
23 Permission is granted to copy and distribute modified versions of
|
|
Chris@19
|
24 this manual under the conditions for verbatim copying, provided
|
|
Chris@19
|
25 that the entire resulting derived work is distributed under the
|
|
Chris@19
|
26 terms of a permission notice identical to this one.
|
|
Chris@19
|
27
|
|
Chris@19
|
28 Permission is granted to copy and distribute translations of this
|
|
Chris@19
|
29 manual into another language, under the above conditions for
|
|
Chris@19
|
30 modified versions, except that this permission notice may be
|
|
Chris@19
|
31 stated in a translation approved by the Free Software Foundation.
|
|
Chris@19
|
32 -->
|
|
Chris@19
|
33 <meta http-equiv="Content-Style-Type" content="text/css">
|
|
Chris@19
|
34 <style type="text/css"><!--
|
|
Chris@19
|
35 pre.display { font-family:inherit }
|
|
Chris@19
|
36 pre.format { font-family:inherit }
|
|
Chris@19
|
37 pre.smalldisplay { font-family:inherit; font-size:smaller }
|
|
Chris@19
|
38 pre.smallformat { font-family:inherit; font-size:smaller }
|
|
Chris@19
|
39 pre.smallexample { font-size:smaller }
|
|
Chris@19
|
40 pre.smalllisp { font-size:smaller }
|
|
Chris@19
|
41 span.sc { font-variant:small-caps }
|
|
Chris@19
|
42 span.roman { font-family:serif; font-weight:normal; }
|
|
Chris@19
|
43 span.sansserif { font-family:sans-serif; font-weight:normal; }
|
|
Chris@19
|
44 --></style>
|
|
Chris@19
|
45 </head>
|
|
Chris@19
|
46 <body>
|
|
Chris@19
|
47 <div class="node">
|
|
Chris@19
|
48 <a name="Calling-FFTW-from-Legacy-Fortran"></a>
|
|
Chris@19
|
49 <p>
|
|
Chris@19
|
50 Next: <a rel="next" accesskey="n" href="Upgrading-from-FFTW-version-2.html#Upgrading-from-FFTW-version-2">Upgrading from FFTW version 2</a>,
|
|
Chris@19
|
51 Previous: <a rel="previous" accesskey="p" href="Calling-FFTW-from-Modern-Fortran.html#Calling-FFTW-from-Modern-Fortran">Calling FFTW from Modern Fortran</a>,
|
|
Chris@19
|
52 Up: <a rel="up" accesskey="u" href="index.html#Top">Top</a>
|
|
Chris@19
|
53 <hr>
|
|
Chris@19
|
54 </div>
|
|
Chris@19
|
55
|
|
Chris@19
|
56 <h2 class="chapter">8 Calling FFTW from Legacy Fortran</h2>
|
|
Chris@19
|
57
|
|
Chris@19
|
58 <p><a name="index-Fortran-interface-580"></a>
|
|
Chris@19
|
59 This chapter describes the interface to FFTW callable by Fortran code
|
|
Chris@19
|
60 in older compilers not supporting the Fortran 2003 C interoperability
|
|
Chris@19
|
61 features (see <a href="Calling-FFTW-from-Modern-Fortran.html#Calling-FFTW-from-Modern-Fortran">Calling FFTW from Modern Fortran</a>). This interface
|
|
Chris@19
|
62 has the major disadvantage that it is not type-checked, so if you
|
|
Chris@19
|
63 mistake the argument types or ordering then your program will not have
|
|
Chris@19
|
64 any compiler errors, and will likely crash at runtime. So, greater
|
|
Chris@19
|
65 care is needed. Also, technically interfacing older Fortran versions
|
|
Chris@19
|
66 to C is nonstandard, but in practice we have found that the techniques
|
|
Chris@19
|
67 used in this chapter have worked with all known Fortran compilers for
|
|
Chris@19
|
68 many years.
|
|
Chris@19
|
69
|
|
Chris@19
|
70 <p>The legacy Fortran interface differs from the C interface only in the
|
|
Chris@19
|
71 prefix (‘<samp><span class="samp">dfftw_</span></samp>’ instead of ‘<samp><span class="samp">fftw_</span></samp>’ in double precision) and
|
|
Chris@19
|
72 a few other minor details. This Fortran interface is included in the
|
|
Chris@19
|
73 FFTW libraries by default, unless a Fortran compiler isn't found on
|
|
Chris@19
|
74 your system or <code>--disable-fortran</code> is included in the
|
|
Chris@19
|
75 <code>configure</code> flags. We assume here that the reader is already
|
|
Chris@19
|
76 familiar with the usage of FFTW in C, as described elsewhere in this
|
|
Chris@19
|
77 manual.
|
|
Chris@19
|
78
|
|
Chris@19
|
79 <p>The MPI parallel interface to FFTW is <em>not</em> currently available
|
|
Chris@19
|
80 to legacy Fortran.
|
|
Chris@19
|
81
|
|
Chris@19
|
82 <ul class="menu">
|
|
Chris@19
|
83 <li><a accesskey="1" href="Fortran_002dinterface-routines.html#Fortran_002dinterface-routines">Fortran-interface routines</a>
|
|
Chris@19
|
84 <li><a accesskey="2" href="FFTW-Constants-in-Fortran.html#FFTW-Constants-in-Fortran">FFTW Constants in Fortran</a>
|
|
Chris@19
|
85 <li><a accesskey="3" href="FFTW-Execution-in-Fortran.html#FFTW-Execution-in-Fortran">FFTW Execution in Fortran</a>
|
|
Chris@19
|
86 <li><a accesskey="4" href="Fortran-Examples.html#Fortran-Examples">Fortran Examples</a>
|
|
Chris@19
|
87 <li><a accesskey="5" href="Wisdom-of-Fortran_003f.html#Wisdom-of-Fortran_003f">Wisdom of Fortran?</a>
|
|
Chris@19
|
88 </ul>
|
|
Chris@19
|
89
|
|
Chris@19
|
90 <!-- -->
|
|
Chris@19
|
91 </body></html>
|
|
Chris@19
|
92
|
