====== FFTW ======

**FFTW** is a software module available on **Comet**.

<WRAP round box important>
**Important!**

Depending on your use case you may __also__ need to look at [[:advanced:software:fftw_mpi|FFTW.MPI]].
</WRAP>

===== FFTW overview =====

To access **FFTW** on Comet, run ''module load FFTW''. This will load the //default// version of **FFTW**.

An overview of the module information is shown below (''module -r spider ^FFTW$''):

<code lang=text>
  FFTW:
    Description:
      FFTW is a C subroutine library for computing the discrete Fourier transform (DFT) in one or more dimensions, of arbitrary input
      size, and of both real and complex data.

     Versions:
        FFTW/3.3.10-GCC-11.3.0
        FFTW/3.3.10-GCC-12.2.0
        FFTW/3.3.10-GCC-12.3.0
        FFTW/3.3.10-GCC-13.2.0
        FFTW/3.3.10-GCC-13.3.0
     Other possible modules matches:
        FFTW.MPI

  To find other possible module matches execute:

      $ module -r spider '.*FFTW.*'

  For detailed information about a specific "FFTW" package (including how to load the modules) use the module's full name.
  Note that names that have a trailing (E) are extensions provided by other modules.
  For example:

     $ module spider FFTW/3.3.10-GCC-13.3.0

 

</code>

If there are multiple versions of **FFTW** listed, then you can load a //specific// version as follows:
<code lang=bash>
$ module load FFTW/version_string
</code>

You can find the most //up to date information// whilst logged on to Comet by running ''module -r spider ^FFTW$''.

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===== FFTW Help =====

The module **FFTW** has the following embedded help text (''module help FFTW''):

<code lang=text>Description
===========
FFTW is a C subroutine library for computing the discrete Fourier transform (DFT)
in one or more dimensions, of arbitrary input size, and of both real and complex data.

More information
================
 - Homepage: https://www.fftw.org

</code>

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===== FFTW Dependencies =====

The //default// version of the module **FFTW** has the following dependencies:

   * GCC/13.3.0

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