Mercurial > octave-nkf

annotate libcruft/fftpack/zpassb3.f @ 12312:b10ea6efdc58 release-3-4-x ss-3-3-91

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version is now 3.3.91
author John W. Eaton <jwe@octave.org>
date Mon, 31 Jan 2011 08:36:58 -0500
parents 82be108cc558
children
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1 subroutine zpassb3 (ido,l1,cc,ch,wa1,wa2)
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2 implicit double precision (a-h,o-z)
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3 dimension cc(ido,3,l1) ,ch(ido,l1,3) ,
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4 1 wa1(1) ,wa2(1)
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5 data taur,taui /-.5,.866025403784439d0/
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6 if (ido .ne. 2) go to 102
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7 do 101 k=1,l1
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8 tr2 = cc(1,2,k)+cc(1,3,k)
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9 cr2 = cc(1,1,k)+taur*tr2
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10 ch(1,k,1) = cc(1,1,k)+tr2
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11 ti2 = cc(2,2,k)+cc(2,3,k)
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12 ci2 = cc(2,1,k)+taur*ti2
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13 ch(2,k,1) = cc(2,1,k)+ti2
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14 cr3 = taui*(cc(1,2,k)-cc(1,3,k))
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15 ci3 = taui*(cc(2,2,k)-cc(2,3,k))
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16 ch(1,k,2) = cr2-ci3
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17 ch(1,k,3) = cr2+ci3
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18 ch(2,k,2) = ci2+cr3
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19 ch(2,k,3) = ci2-cr3
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20 101 continue
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21 return
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22 102 do 104 k=1,l1
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23 do 103 i=2,ido,2
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24 tr2 = cc(i-1,2,k)+cc(i-1,3,k)
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25 cr2 = cc(i-1,1,k)+taur*tr2
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26 ch(i-1,k,1) = cc(i-1,1,k)+tr2
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27 ti2 = cc(i,2,k)+cc(i,3,k)
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28 ci2 = cc(i,1,k)+taur*ti2
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29 ch(i,k,1) = cc(i,1,k)+ti2
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30 cr3 = taui*(cc(i-1,2,k)-cc(i-1,3,k))
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31 ci3 = taui*(cc(i,2,k)-cc(i,3,k))
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32 dr2 = cr2-ci3
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33 dr3 = cr2+ci3
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34 di2 = ci2+cr3
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35 di3 = ci2-cr3
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36 ch(i,k,2) = wa1(i-1)*di2+wa1(i)*dr2
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37 ch(i-1,k,2) = wa1(i-1)*dr2-wa1(i)*di2
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38 ch(i,k,3) = wa2(i-1)*di3+wa2(i)*dr3
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39 ch(i-1,k,3) = wa2(i-1)*dr3-wa2(i)*di3
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40 103 continue
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41 104 continue
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42 return
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43 end