| 1 | Web site for convert.f90: |
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| 2 | ftp://ftp.numerical.rl.ac.uk/pub/MandR/convert.f90 |
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| 3 | |
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| 4 | ! Copyright CERN, Geneva 1991, 1997 - Copyright and any other |
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| 5 | ! appropriate legal protection of these computer programs |
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| 6 | ! and associated documentation reserved in all countries |
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| 7 | ! of the world. |
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| 8 | ! Author: Michael Metcalf (MichaelMetcalf@compuserve.com) |
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| 9 | |
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| 10 | ====================================================== |
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| 11 | |
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| 12 | Web site for fftpack5: |
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| 13 | http://www.cisl.ucar.edu/css/software/fftpack5/ |
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| 14 | |
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| 15 | FFTPACK is a Fortran subroutine library of Fast Fourier Transforms (FFT's) |
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| 16 | developed at the National Center for Atmospheric Research. Version 5 of the |
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| 17 | library was written by Paul Swarztrauber and Richard Valent in the mid |
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| 18 | 1990's. This release of FFTPACK includes single and multiple instance |
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| 19 | complex-to-complex and real-to-real transforms, two-dimensional complex- |
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| 20 | to-complex and real-to-complex transforms, and a collection of sine and |
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| 21 | cosine transforms. |
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| 22 | |
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| 23 | References |
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| 24 | |
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| 25 | (1) Vectorizing the Fast Fourier Transforms, by Paul Swarztrauber, |
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| 26 | Parallel Computations, G. Rodrigue, ed., Academic Press, New York 1982. |
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| 27 | |
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| 28 | (2) Fast Fourier Transforms Algorithms for Vector Computers, by Paul |
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| 29 | Swarztrauber, Parallel Computing, (1984) pp.45-63. |
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| 30 | |
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| 31 | (3) Symmetric FFTs, by P. N. Swarztrauber, Mathematics of Computation 47(1986), |
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| 32 | pp. 323-346. |
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| 33 | |
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| 34 | ========== |
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| 35 | |
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| 36 | The WRF usage of the fftpack5 package is for filtering high-latitude |
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| 37 | data for usage in the global implementation. The files have been |
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| 38 | moved from little .f files to big .F files (to adopt the WRF convention). |
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| 39 | Additionally, the Makefile has been modified to accomodate this small |
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| 40 | naming change for the default suffix. |
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| 41 | |
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| 42 | The fftpack source has been changed by the convert.f90 program, turning |
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| 43 | the code into free-format. The only other modification is that the |
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| 44 | imbedded tabs in the source have been turned into spaces (otherwise |
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| 45 | convert.f90 coughs up a spleen). |
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