Mercurial > octave-nkf
comparison libcruft/fftpack/zpassf2.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> |
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| date | Sun, 27 Apr 2008 22:34:17 +0200 |
| parents | |
| children |
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| 7788:45f5faba05a2 | 7789:82be108cc558 |
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| 1 subroutine zpassf2 (ido,l1,cc,ch,wa1) | |
| 2 implicit double precision (a-h,o-z) | |
| 3 dimension cc(ido,2,l1) ,ch(ido,l1,2) , | |
| 4 1 wa1(1) | |
| 5 if (ido .gt. 2) go to 102 | |
| 6 do 101 k=1,l1 | |
| 7 ch(1,k,1) = cc(1,1,k)+cc(1,2,k) | |
| 8 ch(1,k,2) = cc(1,1,k)-cc(1,2,k) | |
| 9 ch(2,k,1) = cc(2,1,k)+cc(2,2,k) | |
| 10 ch(2,k,2) = cc(2,1,k)-cc(2,2,k) | |
| 11 101 continue | |
| 12 return | |
| 13 102 do 104 k=1,l1 | |
| 14 do 103 i=2,ido,2 | |
| 15 ch(i-1,k,1) = cc(i-1,1,k)+cc(i-1,2,k) | |
| 16 tr2 = cc(i-1,1,k)-cc(i-1,2,k) | |
| 17 ch(i,k,1) = cc(i,1,k)+cc(i,2,k) | |
| 18 ti2 = cc(i,1,k)-cc(i,2,k) | |
| 19 ch(i,k,2) = wa1(i-1)*ti2-wa1(i)*tr2 | |
| 20 ch(i-1,k,2) = wa1(i-1)*tr2+wa1(i)*ti2 | |
| 21 103 continue | |
| 22 104 continue | |
| 23 return | |
| 24 end |