1 | !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC |
---|
2 | ! |
---|
3 | ! FFTPACK 5.0 |
---|
4 | ! Copyright (C) 1995-2004, Scientific Computing Division, |
---|
5 | ! University Corporation for Atmospheric Research |
---|
6 | ! Licensed under the GNU General Public License (GPL) |
---|
7 | ! |
---|
8 | ! Authors: Paul N. Swarztrauber and Richard A. Valent |
---|
9 | ! |
---|
10 | ! $Id: mradf4.f,v 1.2 2004/06/15 21:29:20 rodney Exp $ |
---|
11 | ! |
---|
12 | !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC |
---|
13 | |
---|
14 | SUBROUTINE MRADF4 (M,IDO,L1,CC,IM1,IN1,CH,IM2,IN2,WA1,WA2,WA3) |
---|
15 | REAL CC(IN1,IDO,L1,4) ,CH(IN2,IDO,4,L1) , & |
---|
16 | & WA1(IDO) ,WA2(IDO) ,WA3(IDO) |
---|
17 | ! |
---|
18 | HSQT2=SQRT(2.)/2. |
---|
19 | M1D = (M-1)*IM1+1 |
---|
20 | M2S = 1-IM2 |
---|
21 | DO 101 K=1,L1 |
---|
22 | M2 = M2S |
---|
23 | DO 1001 M1=1,M1D,IM1 |
---|
24 | M2 = M2+IM2 |
---|
25 | CH(M2,1,1,K) = (CC(M1,1,K,2)+CC(M1,1,K,4)) & |
---|
26 | & +(CC(M1,1,K,1)+CC(M1,1,K,3)) |
---|
27 | CH(M2,IDO,4,K) = (CC(M1,1,K,1)+CC(M1,1,K,3)) & |
---|
28 | & -(CC(M1,1,K,2)+CC(M1,1,K,4)) |
---|
29 | CH(M2,IDO,2,K) = CC(M1,1,K,1)-CC(M1,1,K,3) |
---|
30 | CH(M2,1,3,K) = CC(M1,1,K,4)-CC(M1,1,K,2) |
---|
31 | 1001 CONTINUE |
---|
32 | 101 END DO |
---|
33 | IF (IDO-2) 107,105,102 |
---|
34 | 102 IDP2 = IDO+2 |
---|
35 | DO 104 K=1,L1 |
---|
36 | DO 103 I=3,IDO,2 |
---|
37 | IC = IDP2-I |
---|
38 | M2 = M2S |
---|
39 | DO 1003 M1=1,M1D,IM1 |
---|
40 | M2 = M2+IM2 |
---|
41 | CH(M2,I-1,1,K) = ((WA1(I-2)*CC(M1,I-1,K,2)+WA1(I-1)* & |
---|
42 | & CC(M1,I,K,2))+(WA3(I-2)*CC(M1,I-1,K,4)+WA3(I-1)* & |
---|
43 | & CC(M1,I,K,4)))+(CC(M1,I-1,K,1)+(WA2(I-2)*CC(M1,I-1,K,3)+ & |
---|
44 | & WA2(I-1)*CC(M1,I,K,3))) |
---|
45 | CH(M2,IC-1,4,K) = (CC(M1,I-1,K,1)+(WA2(I-2)*CC(M1,I-1,K,3)+ & |
---|
46 | & WA2(I-1)*CC(M1,I,K,3)))-((WA1(I-2)*CC(M1,I-1,K,2)+ & |
---|
47 | & WA1(I-1)*CC(M1,I,K,2))+(WA3(I-2)*CC(M1,I-1,K,4)+ & |
---|
48 | & WA3(I-1)*CC(M1,I,K,4))) |
---|
49 | CH(M2,I,1,K) = ((WA1(I-2)*CC(M1,I,K,2)-WA1(I-1)* & |
---|
50 | & CC(M1,I-1,K,2))+(WA3(I-2)*CC(M1,I,K,4)-WA3(I-1)* & |
---|
51 | & CC(M1,I-1,K,4)))+(CC(M1,I,K,1)+(WA2(I-2)*CC(M1,I,K,3)- & |
---|
52 | & WA2(I-1)*CC(M1,I-1,K,3))) |
---|
53 | CH(M2,IC,4,K) = ((WA1(I-2)*CC(M1,I,K,2)-WA1(I-1)* & |
---|
54 | & CC(M1,I-1,K,2))+(WA3(I-2)*CC(M1,I,K,4)-WA3(I-1)* & |
---|
55 | & CC(M1,I-1,K,4)))-(CC(M1,I,K,1)+(WA2(I-2)*CC(M1,I,K,3)- & |
---|
56 | & WA2(I-1)*CC(M1,I-1,K,3))) |
---|
57 | CH(M2,I-1,3,K) = ((WA1(I-2)*CC(M1,I,K,2)-WA1(I-1)* & |
---|
58 | & CC(M1,I-1,K,2))-(WA3(I-2)*CC(M1,I,K,4)-WA3(I-1)* & |
---|
59 | & CC(M1,I-1,K,4)))+(CC(M1,I-1,K,1)-(WA2(I-2)*CC(M1,I-1,K,3)+ & |
---|
60 | & WA2(I-1)*CC(M1,I,K,3))) |
---|
61 | CH(M2,IC-1,2,K) = (CC(M1,I-1,K,1)-(WA2(I-2)*CC(M1,I-1,K,3)+ & |
---|
62 | & WA2(I-1)*CC(M1,I,K,3)))-((WA1(I-2)*CC(M1,I,K,2)-WA1(I-1)* & |
---|
63 | & CC(M1,I-1,K,2))-(WA3(I-2)*CC(M1,I,K,4)-WA3(I-1)* & |
---|
64 | & CC(M1,I-1,K,4))) |
---|
65 | CH(M2,I,3,K) = ((WA3(I-2)*CC(M1,I-1,K,4)+WA3(I-1)* & |
---|
66 | & CC(M1,I,K,4))-(WA1(I-2)*CC(M1,I-1,K,2)+WA1(I-1)* & |
---|
67 | & CC(M1,I,K,2)))+(CC(M1,I,K,1)-(WA2(I-2)*CC(M1,I,K,3)- & |
---|
68 | & WA2(I-1)*CC(M1,I-1,K,3))) |
---|
69 | CH(M2,IC,2,K) = ((WA3(I-2)*CC(M1,I-1,K,4)+WA3(I-1)* & |
---|
70 | & CC(M1,I,K,4))-(WA1(I-2)*CC(M1,I-1,K,2)+WA1(I-1)* & |
---|
71 | & CC(M1,I,K,2)))-(CC(M1,I,K,1)-(WA2(I-2)*CC(M1,I,K,3)- & |
---|
72 | & WA2(I-1)*CC(M1,I-1,K,3))) |
---|
73 | 1003 CONTINUE |
---|
74 | 103 CONTINUE |
---|
75 | 104 END DO |
---|
76 | IF (MOD(IDO,2) .EQ. 1) RETURN |
---|
77 | 105 CONTINUE |
---|
78 | DO 106 K=1,L1 |
---|
79 | M2 = M2S |
---|
80 | DO 1006 M1=1,M1D,IM1 |
---|
81 | M2 = M2+IM2 |
---|
82 | CH(M2,IDO,1,K) = (HSQT2*(CC(M1,IDO,K,2)-CC(M1,IDO,K,4)))+ & |
---|
83 | & CC(M1,IDO,K,1) |
---|
84 | CH(M2,IDO,3,K) = CC(M1,IDO,K,1)-(HSQT2*(CC(M1,IDO,K,2)- & |
---|
85 | & CC(M1,IDO,K,4))) |
---|
86 | CH(M2,1,2,K) = (-HSQT2*(CC(M1,IDO,K,2)+CC(M1,IDO,K,4)))- & |
---|
87 | & CC(M1,IDO,K,3) |
---|
88 | CH(M2,1,4,K) = (-HSQT2*(CC(M1,IDO,K,2)+CC(M1,IDO,K,4)))+ & |
---|
89 | & CC(M1,IDO,K,3) |
---|
90 | 1006 CONTINUE |
---|
91 | 106 END DO |
---|
92 | 107 RETURN |
---|
93 | END |
---|