[1] | 1 | !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC |
---|
| 2 | ! |
---|
| 3 | ! FFTPACK 5.0 |
---|
| 4 | ! |
---|
| 5 | ! Authors: Paul N. Swarztrauber and Richard A. Valent |
---|
| 6 | ! |
---|
| 7 | ! $Id: mradb2.f,v 1.2 2004/06/15 21:29:19 rodney Exp $ |
---|
| 8 | ! |
---|
| 9 | !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC |
---|
| 10 | |
---|
| 11 | SUBROUTINE MRADB2 (M,IDO,L1,CC,IM1,IN1,CH,IM2,IN2,WA1) |
---|
| 12 | REAL CC(IN1,IDO,2,L1), CH(IN2,IDO,L1,2), WA1(IDO) |
---|
| 13 | ! |
---|
| 14 | M1D = (M-1)*IM1+1 |
---|
| 15 | M2S = 1-IM2 |
---|
| 16 | DO 101 K=1,L1 |
---|
| 17 | M2 = M2S |
---|
| 18 | DO 1001 M1=1,M1D,IM1 |
---|
| 19 | M2 = M2+IM2 |
---|
| 20 | CH(M2,1,K,1) = CC(M1,1,1,K)+CC(M1,IDO,2,K) |
---|
| 21 | CH(M2,1,K,2) = CC(M1,1,1,K)-CC(M1,IDO,2,K) |
---|
| 22 | 1001 CONTINUE |
---|
| 23 | 101 END DO |
---|
| 24 | IF (IDO-2) 107,105,102 |
---|
| 25 | 102 IDP2 = IDO+2 |
---|
| 26 | DO 104 K=1,L1 |
---|
| 27 | DO 103 I=3,IDO,2 |
---|
| 28 | IC = IDP2-I |
---|
| 29 | M2 = M2S |
---|
| 30 | DO 1002 M1=1,M1D,IM1 |
---|
| 31 | M2 = M2+IM2 |
---|
| 32 | CH(M2,I-1,K,1) = CC(M1,I-1,1,K)+CC(M1,IC-1,2,K) |
---|
| 33 | CH(M2,I,K,1) = CC(M1,I,1,K)-CC(M1,IC,2,K) |
---|
| 34 | CH(M2,I-1,K,2) = WA1(I-2)*(CC(M1,I-1,1,K)-CC(M1,IC-1,2,K)) & |
---|
| 35 | & -WA1(I-1)*(CC(M1,I,1,K)+CC(M1,IC,2,K)) |
---|
| 36 | CH(M2,I,K,2) = WA1(I-2)*(CC(M1,I,1,K)+CC(M1,IC,2,K))+WA1(I-1) & |
---|
| 37 | & *(CC(M1,I-1,1,K)-CC(M1,IC-1,2,K)) |
---|
| 38 | 1002 CONTINUE |
---|
| 39 | 103 CONTINUE |
---|
| 40 | 104 END DO |
---|
| 41 | IF (MOD(IDO,2) .EQ. 1) RETURN |
---|
| 42 | 105 DO 106 K=1,L1 |
---|
| 43 | M2 = M2S |
---|
| 44 | DO 1003 M1=1,M1D,IM1 |
---|
| 45 | M2 = M2+IM2 |
---|
| 46 | CH(M2,IDO,K,1) = CC(M1,IDO,1,K)+CC(M1,IDO,1,K) |
---|
| 47 | CH(M2,IDO,K,2) = -(CC(M1,1,2,K)+CC(M1,1,2,K)) |
---|
| 48 | 1003 CONTINUE |
---|
| 49 | 106 END DO |
---|
| 50 | 107 RETURN |
---|
| 51 | END |
---|