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- PFFFT: a pretty fast FFT.
- Qt 6.7.3 Reference Documentation

# PFFFT: a pretty fast FFT.

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     Copyright (c) 2013  Julien Pommier ( pommier@modartt.com )

     Based on original fortran 77 code from FFTPACKv4 from NETLIB,
     authored by Dr Paul Swarztrauber of NCAR, in 1985.

     As confirmed by the NCAR fftpack software curators, the following
     FFTPACKv5 license applies to FFTPACKv4 sources. My changes are
     released under the same terms.

     FFTPACK license:

     http://www.cisl.ucar.edu/css/software/fftpack5/ftpk.html

     Copyright (c) 2004 the University Corporation for Atmospheric
     Research (&quot;UCAR&quot;). All rights reserved. Developed by NCAR&#x27;s
     Computational and Information Systems Laboratory, UCAR,
     www.cisl.ucar.edu.

     Redistribution and use of the Software in source and binary forms,
     with or without modification, is permitted provided that the
     following conditions are met:

     - Neither the names of NCAR&#x27;s Computational and Information Systems
     Laboratory, the University Corporation for Atmospheric Research,
     nor the names of its sponsors or contributors may be used to
     endorse or promote products derived from this Software without
     specific prior written permission.

     - Redistributions of source code must retain the above copyright
     notices, this list of conditions, and the disclaimer below.

     - Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions, and the disclaimer below in the
     documentation and/or other materials provided with the
     distribution.

     THIS SOFTWARE IS PROVIDED &quot;AS IS&quot;, WITHOUT WARRANTY OF ANY KIND,
     EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO THE WARRANTIES OF
     MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
     NONINFRINGEMENT. IN NO EVENT SHALL THE CONTRIBUTORS OR COPYRIGHT
     HOLDERS BE LIABLE FOR ANY CLAIM, INDIRECT, INCIDENTAL, SPECIAL,
     EXEMPLARY, OR CONSEQUENTIAL DAMAGES OR OTHER LIABILITY, WHETHER IN AN
     ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
     CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS WITH THE
     SOFTWARE.