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Add FFTW3
author Chris Cannam
date Wed, 20 Mar 2013 15:35:50 +0000
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+<title>Calling FFTW from Legacy Fortran - FFTW 3.3.3</title>
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+Copyright (C) 2003 Matteo Frigo.
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+Next:&nbsp;<a rel="next" accesskey="n" href="Upgrading-from-FFTW-version-2.html#Upgrading-from-FFTW-version-2">Upgrading from FFTW version 2</a>,
+Previous:&nbsp;<a rel="previous" accesskey="p" href="Calling-FFTW-from-Modern-Fortran.html#Calling-FFTW-from-Modern-Fortran">Calling FFTW from Modern Fortran</a>,
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+
+<h2 class="chapter">8 Calling FFTW from Legacy Fortran</h2>
+
+<p><a name="index-Fortran-interface-577"></a>
+This chapter describes the interface to FFTW callable by Fortran code
+in older compilers not supporting the Fortran 2003 C interoperability
+features (see <a href="Calling-FFTW-from-Modern-Fortran.html#Calling-FFTW-from-Modern-Fortran">Calling FFTW from Modern Fortran</a>).  This interface
+has the major disadvantage that it is not type-checked, so if you
+mistake the argument types or ordering then your program will not have
+any compiler errors, and will likely crash at runtime.  So, greater
+care is needed.  Also, technically interfacing older Fortran versions
+to C is nonstandard, but in practice we have found that the techniques
+used in this chapter have worked with all known Fortran compilers for
+many years.
+
+   <p>The legacy Fortran interface differs from the C interface only in the
+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
+a few other minor details.  This Fortran interface is included in the
+FFTW libraries by default, unless a Fortran compiler isn't found on
+your system or <code>--disable-fortran</code> is included in the
+<code>configure</code> flags.  We assume here that the reader is already
+familiar with the usage of FFTW in C, as described elsewhere in this
+manual.
+
+   <p>The MPI parallel interface to FFTW is <em>not</em> currently available
+to legacy Fortran.
+
+<ul class="menu">
+<li><a accesskey="1" href="Fortran_002dinterface-routines.html#Fortran_002dinterface-routines">Fortran-interface routines</a>
+<li><a accesskey="2" href="FFTW-Constants-in-Fortran.html#FFTW-Constants-in-Fortran">FFTW Constants in Fortran</a>
+<li><a accesskey="3" href="FFTW-Execution-in-Fortran.html#FFTW-Execution-in-Fortran">FFTW Execution in Fortran</a>
+<li><a accesskey="4" href="Fortran-Examples.html#Fortran-Examples">Fortran Examples</a>
+<li><a accesskey="5" href="Wisdom-of-Fortran_003f.html#Wisdom-of-Fortran_003f">Wisdom of Fortran?</a>
+</ul>
+
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