Mercurial > octave-nkf
comparison libcruft/fftpack/passf5.f @ 2329:30c606bec7a8
[project @ 1996-07-19 01:29:05 by jwe]
Initial revision
| author | jwe |
|---|---|
| date | Fri, 19 Jul 1996 01:29:55 +0000 |
| parents | |
| children | fccab8e7d35f |
comparison
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| 2328:b44c3b2a5fce | 2329:30c606bec7a8 |
|---|---|
| 1 subroutine passf5 (ido,l1,cc,ch,wa1,wa2,wa3,wa4) | |
| 2 implicit double precision (a-h,o-z) | |
| 3 dimension cc(ido,5,l1) ,ch(ido,l1,5) , | |
| 4 1 wa1(1) ,wa2(1) ,wa3(1) ,wa4(1) | |
| 5 data tr11,ti11,tr12,ti12 /.309016994374947,-.951056516295154, | |
| 6 1-.809016994374947,-.587785252292473/ | |
| 7 if (ido .ne. 2) go to 102 | |
| 8 do 101 k=1,l1 | |
| 9 ti5 = cc(2,2,k)-cc(2,5,k) | |
| 10 ti2 = cc(2,2,k)+cc(2,5,k) | |
| 11 ti4 = cc(2,3,k)-cc(2,4,k) | |
| 12 ti3 = cc(2,3,k)+cc(2,4,k) | |
| 13 tr5 = cc(1,2,k)-cc(1,5,k) | |
| 14 tr2 = cc(1,2,k)+cc(1,5,k) | |
| 15 tr4 = cc(1,3,k)-cc(1,4,k) | |
| 16 tr3 = cc(1,3,k)+cc(1,4,k) | |
| 17 ch(1,k,1) = cc(1,1,k)+tr2+tr3 | |
| 18 ch(2,k,1) = cc(2,1,k)+ti2+ti3 | |
| 19 cr2 = cc(1,1,k)+tr11*tr2+tr12*tr3 | |
| 20 ci2 = cc(2,1,k)+tr11*ti2+tr12*ti3 | |
| 21 cr3 = cc(1,1,k)+tr12*tr2+tr11*tr3 | |
| 22 ci3 = cc(2,1,k)+tr12*ti2+tr11*ti3 | |
| 23 cr5 = ti11*tr5+ti12*tr4 | |
| 24 ci5 = ti11*ti5+ti12*ti4 | |
| 25 cr4 = ti12*tr5-ti11*tr4 | |
| 26 ci4 = ti12*ti5-ti11*ti4 | |
| 27 ch(1,k,2) = cr2-ci5 | |
| 28 ch(1,k,5) = cr2+ci5 | |
| 29 ch(2,k,2) = ci2+cr5 | |
| 30 ch(2,k,3) = ci3+cr4 | |
| 31 ch(1,k,3) = cr3-ci4 | |
| 32 ch(1,k,4) = cr3+ci4 | |
| 33 ch(2,k,4) = ci3-cr4 | |
| 34 ch(2,k,5) = ci2-cr5 | |
| 35 101 continue | |
| 36 return | |
| 37 102 do 104 k=1,l1 | |
| 38 do 103 i=2,ido,2 | |
| 39 ti5 = cc(i,2,k)-cc(i,5,k) | |
| 40 ti2 = cc(i,2,k)+cc(i,5,k) | |
| 41 ti4 = cc(i,3,k)-cc(i,4,k) | |
| 42 ti3 = cc(i,3,k)+cc(i,4,k) | |
| 43 tr5 = cc(i-1,2,k)-cc(i-1,5,k) | |
| 44 tr2 = cc(i-1,2,k)+cc(i-1,5,k) | |
| 45 tr4 = cc(i-1,3,k)-cc(i-1,4,k) | |
| 46 tr3 = cc(i-1,3,k)+cc(i-1,4,k) | |
| 47 ch(i-1,k,1) = cc(i-1,1,k)+tr2+tr3 | |
| 48 ch(i,k,1) = cc(i,1,k)+ti2+ti3 | |
| 49 cr2 = cc(i-1,1,k)+tr11*tr2+tr12*tr3 | |
| 50 ci2 = cc(i,1,k)+tr11*ti2+tr12*ti3 | |
| 51 cr3 = cc(i-1,1,k)+tr12*tr2+tr11*tr3 | |
| 52 ci3 = cc(i,1,k)+tr12*ti2+tr11*ti3 | |
| 53 cr5 = ti11*tr5+ti12*tr4 | |
| 54 ci5 = ti11*ti5+ti12*ti4 | |
| 55 cr4 = ti12*tr5-ti11*tr4 | |
| 56 ci4 = ti12*ti5-ti11*ti4 | |
| 57 dr3 = cr3-ci4 | |
| 58 dr4 = cr3+ci4 | |
| 59 di3 = ci3+cr4 | |
| 60 di4 = ci3-cr4 | |
| 61 dr5 = cr2+ci5 | |
| 62 dr2 = cr2-ci5 | |
| 63 di5 = ci2-cr5 | |
| 64 di2 = ci2+cr5 | |
| 65 ch(i-1,k,2) = wa1(i-1)*dr2+wa1(i)*di2 | |
| 66 ch(i,k,2) = wa1(i-1)*di2-wa1(i)*dr2 | |
| 67 ch(i-1,k,3) = wa2(i-1)*dr3+wa2(i)*di3 | |
| 68 ch(i,k,3) = wa2(i-1)*di3-wa2(i)*dr3 | |
| 69 ch(i-1,k,4) = wa3(i-1)*dr4+wa3(i)*di4 | |
| 70 ch(i,k,4) = wa3(i-1)*di4-wa3(i)*dr4 | |
| 71 ch(i-1,k,5) = wa4(i-1)*dr5+wa4(i)*di5 | |
| 72 ch(i,k,5) = wa4(i-1)*di5-wa4(i)*dr5 | |
| 73 103 continue | |
| 74 104 continue | |
| 75 return | |
| 76 end |