| 1 | !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC |
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| 2 | ! |
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| 3 | ! FFTPACK 5.0 |
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| 4 | ! Copyright (C) 1995-2004, Scientific Computing Division, |
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| 5 | ! University Corporation for Atmospheric Research |
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| 6 | ! Licensed under the GNU General Public License (GPL) |
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| 7 | ! |
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| 8 | ! Authors: Paul N. Swarztrauber and Richard A. Valent |
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| 9 | ! |
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| 10 | ! $Id: mradb4.f,v 1.2 2004/06/15 21:29:19 rodney Exp $ |
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| 11 | ! |
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| 12 | !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC |
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| 13 | |
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| 14 | SUBROUTINE MRADB4 (M,IDO,L1,CC,IM1,IN1,CH,IM2,IN2,WA1,WA2,WA3) |
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| 15 | REAL CC(IN1,IDO,4,L1) ,CH(IN2,IDO,L1,4) , & |
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| 16 | & WA1(IDO) , WA2(IDO) , WA3(IDO) |
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| 17 | ! |
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| 18 | M1D = (M-1)*IM1+1 |
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| 19 | M2S = 1-IM2 |
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| 20 | SQRT2=SQRT(2.) |
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| 21 | DO 101 K=1,L1 |
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| 22 | M2 = M2S |
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| 23 | DO 1001 M1=1,M1D,IM1 |
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| 24 | M2 = M2+IM2 |
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| 25 | CH(M2,1,K,3) = (CC(M1,1,1,K)+CC(M1,IDO,4,K)) & |
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| 26 | & -(CC(M1,IDO,2,K)+CC(M1,IDO,2,K)) |
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| 27 | CH(M2,1,K,1) = (CC(M1,1,1,K)+CC(M1,IDO,4,K)) & |
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| 28 | & +(CC(M1,IDO,2,K)+CC(M1,IDO,2,K)) |
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| 29 | CH(M2,1,K,4) = (CC(M1,1,1,K)-CC(M1,IDO,4,K)) & |
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| 30 | & +(CC(M1,1,3,K)+CC(M1,1,3,K)) |
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| 31 | CH(M2,1,K,2) = (CC(M1,1,1,K)-CC(M1,IDO,4,K)) & |
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| 32 | & -(CC(M1,1,3,K)+CC(M1,1,3,K)) |
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| 33 | 1001 CONTINUE |
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| 34 | 101 END DO |
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| 35 | IF (IDO-2) 107,105,102 |
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| 36 | 102 IDP2 = IDO+2 |
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| 37 | DO 104 K=1,L1 |
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| 38 | DO 103 I=3,IDO,2 |
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| 39 | IC = IDP2-I |
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| 40 | M2 = M2S |
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| 41 | DO 1002 M1=1,M1D,IM1 |
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| 42 | M2 = M2+IM2 |
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| 43 | CH(M2,I-1,K,1) = (CC(M1,I-1,1,K)+CC(M1,IC-1,4,K)) & |
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| 44 | & +(CC(M1,I-1,3,K)+CC(M1,IC-1,2,K)) |
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| 45 | CH(M2,I,K,1) = (CC(M1,I,1,K)-CC(M1,IC,4,K)) & |
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| 46 | & +(CC(M1,I,3,K)-CC(M1,IC,2,K)) |
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| 47 | CH(M2,I-1,K,2)=WA1(I-2)*((CC(M1,I-1,1,K)-CC(M1,IC-1,4,K)) & |
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| 48 | & -(CC(M1,I,3,K)+CC(M1,IC,2,K)))-WA1(I-1) & |
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| 49 | & *((CC(M1,I,1,K)+CC(M1,IC,4,K))+(CC(M1,I-1,3,K)-CC(M1,IC-1,2,K))) |
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| 50 | CH(M2,I,K,2)=WA1(I-2)*((CC(M1,I,1,K)+CC(M1,IC,4,K)) & |
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| 51 | & +(CC(M1,I-1,3,K)-CC(M1,IC-1,2,K)))+WA1(I-1) & |
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| 52 | & *((CC(M1,I-1,1,K)-CC(M1,IC-1,4,K))-(CC(M1,I,3,K)+CC(M1,IC,2,K))) |
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| 53 | CH(M2,I-1,K,3)=WA2(I-2)*((CC(M1,I-1,1,K)+CC(M1,IC-1,4,K)) & |
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| 54 | & -(CC(M1,I-1,3,K)+CC(M1,IC-1,2,K)))-WA2(I-1) & |
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| 55 | & *((CC(M1,I,1,K)-CC(M1,IC,4,K))-(CC(M1,I,3,K)-CC(M1,IC,2,K))) |
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| 56 | CH(M2,I,K,3)=WA2(I-2)*((CC(M1,I,1,K)-CC(M1,IC,4,K)) & |
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| 57 | & -(CC(M1,I,3,K)-CC(M1,IC,2,K)))+WA2(I-1) & |
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| 58 | & *((CC(M1,I-1,1,K)+CC(M1,IC-1,4,K))-(CC(M1,I-1,3,K) & |
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| 59 | & +CC(M1,IC-1,2,K))) |
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| 60 | CH(M2,I-1,K,4)=WA3(I-2)*((CC(M1,I-1,1,K)-CC(M1,IC-1,4,K)) & |
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| 61 | & +(CC(M1,I,3,K)+CC(M1,IC,2,K)))-WA3(I-1) & |
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| 62 | & *((CC(M1,I,1,K)+CC(M1,IC,4,K))-(CC(M1,I-1,3,K)-CC(M1,IC-1,2,K))) |
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| 63 | CH(M2,I,K,4)=WA3(I-2)*((CC(M1,I,1,K)+CC(M1,IC,4,K)) & |
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| 64 | & -(CC(M1,I-1,3,K)-CC(M1,IC-1,2,K)))+WA3(I-1) & |
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| 65 | & *((CC(M1,I-1,1,K)-CC(M1,IC-1,4,K))+(CC(M1,I,3,K)+CC(M1,IC,2,K))) |
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| 66 | 1002 CONTINUE |
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| 67 | 103 CONTINUE |
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| 68 | 104 END DO |
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| 69 | IF (MOD(IDO,2) .EQ. 1) RETURN |
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| 70 | 105 CONTINUE |
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| 71 | DO 106 K=1,L1 |
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| 72 | M2 = M2S |
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| 73 | DO 1003 M1=1,M1D,IM1 |
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| 74 | M2 = M2+IM2 |
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| 75 | CH(M2,IDO,K,1) = (CC(M1,IDO,1,K)+CC(M1,IDO,3,K)) & |
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| 76 | & +(CC(M1,IDO,1,K)+CC(M1,IDO,3,K)) |
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| 77 | CH(M2,IDO,K,2) = SQRT2*((CC(M1,IDO,1,K)-CC(M1,IDO,3,K)) & |
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| 78 | & -(CC(M1,1,2,K)+CC(M1,1,4,K))) |
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| 79 | CH(M2,IDO,K,3) = (CC(M1,1,4,K)-CC(M1,1,2,K)) & |
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| 80 | & +(CC(M1,1,4,K)-CC(M1,1,2,K)) |
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| 81 | CH(M2,IDO,K,4) = -SQRT2*((CC(M1,IDO,1,K)-CC(M1,IDO,3,K)) & |
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| 82 | & +(CC(M1,1,2,K)+CC(M1,1,4,K))) |
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| 83 | 1003 CONTINUE |
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| 84 | 106 END DO |
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| 85 | 107 RETURN |
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| 86 | END |
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