Mercurial > octave-nkf
comparison libcruft/fftpack/cfftb.f @ 7789:82be108cc558
First attempt at single precision tyeps
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corrections to qrupdate single precision routines
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prefer demotion to single over promotion to double
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Add single precision support to log2 function
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Trivial PROJECT file update
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Cache optimized hermitian/transpose methods
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Add tests for tranpose/hermitian and ChangeLog entry for new transpose code
| author | David Bateman <dbateman@free.fr> |
|---|---|
| date | Sun, 27 Apr 2008 22:34:17 +0200 |
| parents | d20a2f261306 |
| children |
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| 7788:45f5faba05a2 | 7789:82be108cc558 |
|---|---|
| 1 subroutine cfftb (n,c,wsave) | 1 subroutine cfftb (n,c,wsave) |
| 2 implicit double precision (a-h,o-z) | |
| 3 dimension c(*) ,wsave(*) | 2 dimension c(*) ,wsave(*) |
| 4 if (n .eq. 1) return | 3 if (n .eq. 1) return |
| 5 iw1 = n+n+1 | 4 iw1 = n+n+1 |
| 6 iw2 = iw1+n+n | 5 iw2 = iw1+n+n |
| 7 call cfftb1 (n,c,wsave,wsave(iw1),wsave(iw2)) | 6 call cfftb1 (n,c,wsave,wsave(iw1),wsave(iw2)) |