| 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: c1f4kb.f,v 1.2 2004/06/15 21:08:32 rodney Exp $ |
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| 11 | ! |
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| 12 | !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC |
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| 13 | |
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| 14 | SUBROUTINE C1F4KB (IDO,L1,NA,CC,IN1,CH,IN2,WA) |
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| 15 | REAL CC(IN1,L1,IDO,4),CH(IN2,L1,4,IDO),WA(IDO,3,2) |
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| 16 | ! |
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| 17 | ! FFTPACK 5.0 auxiliary routine |
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| 18 | ! |
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| 19 | IF (IDO.GT.1 .OR. NA.EQ.1) GO TO 102 |
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| 20 | DO 101 K=1,L1 |
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| 21 | TI1 = CC(2,K,1,1)-CC(2,K,1,3) |
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| 22 | TI2 = CC(2,K,1,1)+CC(2,K,1,3) |
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| 23 | TR4 = CC(2,K,1,4)-CC(2,K,1,2) |
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| 24 | TI3 = CC(2,K,1,2)+CC(2,K,1,4) |
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| 25 | TR1 = CC(1,K,1,1)-CC(1,K,1,3) |
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| 26 | TR2 = CC(1,K,1,1)+CC(1,K,1,3) |
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| 27 | TI4 = CC(1,K,1,2)-CC(1,K,1,4) |
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| 28 | TR3 = CC(1,K,1,2)+CC(1,K,1,4) |
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| 29 | CC(1,K,1,1) = TR2+TR3 |
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| 30 | CC(1,K,1,3) = TR2-TR3 |
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| 31 | CC(2,K,1,1) = TI2+TI3 |
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| 32 | CC(2,K,1,3) = TI2-TI3 |
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| 33 | CC(1,K,1,2) = TR1+TR4 |
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| 34 | CC(1,K,1,4) = TR1-TR4 |
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| 35 | CC(2,K,1,2) = TI1+TI4 |
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| 36 | CC(2,K,1,4) = TI1-TI4 |
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| 37 | 101 END DO |
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| 38 | RETURN |
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| 39 | 102 DO 103 K=1,L1 |
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| 40 | TI1 = CC(2,K,1,1)-CC(2,K,1,3) |
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| 41 | TI2 = CC(2,K,1,1)+CC(2,K,1,3) |
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| 42 | TR4 = CC(2,K,1,4)-CC(2,K,1,2) |
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| 43 | TI3 = CC(2,K,1,2)+CC(2,K,1,4) |
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| 44 | TR1 = CC(1,K,1,1)-CC(1,K,1,3) |
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| 45 | TR2 = CC(1,K,1,1)+CC(1,K,1,3) |
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| 46 | TI4 = CC(1,K,1,2)-CC(1,K,1,4) |
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| 47 | TR3 = CC(1,K,1,2)+CC(1,K,1,4) |
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| 48 | CH(1,K,1,1) = TR2+TR3 |
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| 49 | CH(1,K,3,1) = TR2-TR3 |
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| 50 | CH(2,K,1,1) = TI2+TI3 |
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| 51 | CH(2,K,3,1) = TI2-TI3 |
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| 52 | CH(1,K,2,1) = TR1+TR4 |
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| 53 | CH(1,K,4,1) = TR1-TR4 |
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| 54 | CH(2,K,2,1) = TI1+TI4 |
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| 55 | CH(2,K,4,1) = TI1-TI4 |
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| 56 | 103 END DO |
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| 57 | IF(IDO .EQ. 1) RETURN |
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| 58 | DO 105 I=2,IDO |
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| 59 | DO 104 K=1,L1 |
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| 60 | TI1 = CC(2,K,I,1)-CC(2,K,I,3) |
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| 61 | TI2 = CC(2,K,I,1)+CC(2,K,I,3) |
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| 62 | TI3 = CC(2,K,I,2)+CC(2,K,I,4) |
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| 63 | TR4 = CC(2,K,I,4)-CC(2,K,I,2) |
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| 64 | TR1 = CC(1,K,I,1)-CC(1,K,I,3) |
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| 65 | TR2 = CC(1,K,I,1)+CC(1,K,I,3) |
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| 66 | TI4 = CC(1,K,I,2)-CC(1,K,I,4) |
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| 67 | TR3 = CC(1,K,I,2)+CC(1,K,I,4) |
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| 68 | CH(1,K,1,I) = TR2+TR3 |
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| 69 | CR3 = TR2-TR3 |
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| 70 | CH(2,K,1,I) = TI2+TI3 |
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| 71 | CI3 = TI2-TI3 |
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| 72 | CR2 = TR1+TR4 |
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| 73 | CR4 = TR1-TR4 |
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| 74 | CI2 = TI1+TI4 |
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| 75 | CI4 = TI1-TI4 |
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| 76 | CH(1,K,2,I) = WA(I,1,1)*CR2-WA(I,1,2)*CI2 |
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| 77 | CH(2,K,2,I) = WA(I,1,1)*CI2+WA(I,1,2)*CR2 |
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| 78 | CH(1,K,3,I) = WA(I,2,1)*CR3-WA(I,2,2)*CI3 |
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| 79 | CH(2,K,3,I) = WA(I,2,1)*CI3+WA(I,2,2)*CR3 |
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| 80 | CH(1,K,4,I) = WA(I,3,1)*CR4-WA(I,3,2)*CI4 |
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| 81 | CH(2,K,4,I) = WA(I,3,1)*CI4+WA(I,3,2)*CR4 |
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| 82 | 104 CONTINUE |
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| 83 | 105 END DO |
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| 84 | RETURN |
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| 85 | END |
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