1 | !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC |
---|
2 | ! |
---|
3 | ! FFTPACK 5.0 |
---|
4 | ! |
---|
5 | ! Authors: Paul N. Swarztrauber and Richard A. Valent |
---|
6 | ! |
---|
7 | ! $Id: cmf4kf.f,v 1.2 2004/06/15 21:08:32 rodney Exp $ |
---|
8 | ! |
---|
9 | !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC |
---|
10 | |
---|
11 | SUBROUTINE CMF4KF (LOT,IDO,L1,NA,CC,IM1,IN1,CH,IM2,IN2,WA) |
---|
12 | REAL CC(2,IN1,L1,IDO,4),CH(2,IN2,L1,4,IDO),WA(IDO,3,2) |
---|
13 | ! |
---|
14 | ! FFTPACK 5.0 auxiliary routine |
---|
15 | ! |
---|
16 | M1D = (LOT-1)*IM1+1 |
---|
17 | M2S = 1-IM2 |
---|
18 | IF (IDO .GT. 1) GO TO 102 |
---|
19 | SN = 1./REAL(4*L1) |
---|
20 | IF (NA .EQ. 1) GO TO 106 |
---|
21 | DO 101 K=1,L1 |
---|
22 | DO 101 M1=1,M1D,IM1 |
---|
23 | TI1 = CC(2,M1,K,1,1)-CC(2,M1,K,1,3) |
---|
24 | TI2 = CC(2,M1,K,1,1)+CC(2,M1,K,1,3) |
---|
25 | TR4 = CC(2,M1,K,1,2)-CC(2,M1,K,1,4) |
---|
26 | TI3 = CC(2,M1,K,1,2)+CC(2,M1,K,1,4) |
---|
27 | TR1 = CC(1,M1,K,1,1)-CC(1,M1,K,1,3) |
---|
28 | TR2 = CC(1,M1,K,1,1)+CC(1,M1,K,1,3) |
---|
29 | TI4 = CC(1,M1,K,1,4)-CC(1,M1,K,1,2) |
---|
30 | TR3 = CC(1,M1,K,1,2)+CC(1,M1,K,1,4) |
---|
31 | CC(1,M1,K,1,1) = SN*(TR2+TR3) |
---|
32 | CC(1,M1,K,1,3) = SN*(TR2-TR3) |
---|
33 | CC(2,M1,K,1,1) = SN*(TI2+TI3) |
---|
34 | CC(2,M1,K,1,3) = SN*(TI2-TI3) |
---|
35 | CC(1,M1,K,1,2) = SN*(TR1+TR4) |
---|
36 | CC(1,M1,K,1,4) = SN*(TR1-TR4) |
---|
37 | CC(2,M1,K,1,2) = SN*(TI1+TI4) |
---|
38 | CC(2,M1,K,1,4) = SN*(TI1-TI4) |
---|
39 | 101 CONTINUE |
---|
40 | RETURN |
---|
41 | 106 DO 107 K=1,L1 |
---|
42 | M2 = M2S |
---|
43 | DO 107 M1=1,M1D,IM1 |
---|
44 | M2 = M2+IM2 |
---|
45 | TI1 = CC(2,M1,K,1,1)-CC(2,M1,K,1,3) |
---|
46 | TI2 = CC(2,M1,K,1,1)+CC(2,M1,K,1,3) |
---|
47 | TR4 = CC(2,M1,K,1,2)-CC(2,M1,K,1,4) |
---|
48 | TI3 = CC(2,M1,K,1,2)+CC(2,M1,K,1,4) |
---|
49 | TR1 = CC(1,M1,K,1,1)-CC(1,M1,K,1,3) |
---|
50 | TR2 = CC(1,M1,K,1,1)+CC(1,M1,K,1,3) |
---|
51 | TI4 = CC(1,M1,K,1,4)-CC(1,M1,K,1,2) |
---|
52 | TR3 = CC(1,M1,K,1,2)+CC(1,M1,K,1,4) |
---|
53 | CH(1,M2,K,1,1) = SN*(TR2+TR3) |
---|
54 | CH(1,M2,K,3,1) = SN*(TR2-TR3) |
---|
55 | CH(2,M2,K,1,1) = SN*(TI2+TI3) |
---|
56 | CH(2,M2,K,3,1) = SN*(TI2-TI3) |
---|
57 | CH(1,M2,K,2,1) = SN*(TR1+TR4) |
---|
58 | CH(1,M2,K,4,1) = SN*(TR1-TR4) |
---|
59 | CH(2,M2,K,2,1) = SN*(TI1+TI4) |
---|
60 | CH(2,M2,K,4,1) = SN*(TI1-TI4) |
---|
61 | 107 CONTINUE |
---|
62 | RETURN |
---|
63 | 102 DO 103 K=1,L1 |
---|
64 | M2 = M2S |
---|
65 | DO 103 M1=1,M1D,IM1 |
---|
66 | M2 = M2+IM2 |
---|
67 | TI1 = CC(2,M1,K,1,1)-CC(2,M1,K,1,3) |
---|
68 | TI2 = CC(2,M1,K,1,1)+CC(2,M1,K,1,3) |
---|
69 | TR4 = CC(2,M1,K,1,2)-CC(2,M1,K,1,4) |
---|
70 | TI3 = CC(2,M1,K,1,2)+CC(2,M1,K,1,4) |
---|
71 | TR1 = CC(1,M1,K,1,1)-CC(1,M1,K,1,3) |
---|
72 | TR2 = CC(1,M1,K,1,1)+CC(1,M1,K,1,3) |
---|
73 | TI4 = CC(1,M1,K,1,4)-CC(1,M1,K,1,2) |
---|
74 | TR3 = CC(1,M1,K,1,2)+CC(1,M1,K,1,4) |
---|
75 | CH(1,M2,K,1,1) = TR2+TR3 |
---|
76 | CH(1,M2,K,3,1) = TR2-TR3 |
---|
77 | CH(2,M2,K,1,1) = TI2+TI3 |
---|
78 | CH(2,M2,K,3,1) = TI2-TI3 |
---|
79 | CH(1,M2,K,2,1) = TR1+TR4 |
---|
80 | CH(1,M2,K,4,1) = TR1-TR4 |
---|
81 | CH(2,M2,K,2,1) = TI1+TI4 |
---|
82 | CH(2,M2,K,4,1) = TI1-TI4 |
---|
83 | 103 CONTINUE |
---|
84 | DO 105 I=2,IDO |
---|
85 | DO 104 K=1,L1 |
---|
86 | M2 = M2S |
---|
87 | DO 104 M1=1,M1D,IM1 |
---|
88 | M2 = M2+IM2 |
---|
89 | TI1 = CC(2,M1,K,I,1)-CC(2,M1,K,I,3) |
---|
90 | TI2 = CC(2,M1,K,I,1)+CC(2,M1,K,I,3) |
---|
91 | TI3 = CC(2,M1,K,I,2)+CC(2,M1,K,I,4) |
---|
92 | TR4 = CC(2,M1,K,I,2)-CC(2,M1,K,I,4) |
---|
93 | TR1 = CC(1,M1,K,I,1)-CC(1,M1,K,I,3) |
---|
94 | TR2 = CC(1,M1,K,I,1)+CC(1,M1,K,I,3) |
---|
95 | TI4 = CC(1,M1,K,I,4)-CC(1,M1,K,I,2) |
---|
96 | TR3 = CC(1,M1,K,I,2)+CC(1,M1,K,I,4) |
---|
97 | CH(1,M2,K,1,I) = TR2+TR3 |
---|
98 | CR3 = TR2-TR3 |
---|
99 | CH(2,M2,K,1,I) = TI2+TI3 |
---|
100 | CI3 = TI2-TI3 |
---|
101 | CR2 = TR1+TR4 |
---|
102 | CR4 = TR1-TR4 |
---|
103 | CI2 = TI1+TI4 |
---|
104 | CI4 = TI1-TI4 |
---|
105 | CH(1,M2,K,2,I) = WA(I,1,1)*CR2+WA(I,1,2)*CI2 |
---|
106 | CH(2,M2,K,2,I) = WA(I,1,1)*CI2-WA(I,1,2)*CR2 |
---|
107 | CH(1,M2,K,3,I) = WA(I,2,1)*CR3+WA(I,2,2)*CI3 |
---|
108 | CH(2,M2,K,3,I) = WA(I,2,1)*CI3-WA(I,2,2)*CR3 |
---|
109 | CH(1,M2,K,4,I) = WA(I,3,1)*CR4+WA(I,3,2)*CI4 |
---|
110 | CH(2,M2,K,4,I) = WA(I,3,1)*CI4-WA(I,3,2)*CR4 |
---|
111 | 104 CONTINUE |
---|
112 | 105 END DO |
---|
113 | RETURN |
---|
114 | END |
---|