standard WRF version 3.0.1.1
[wrffire.git] / wrfv2_fire / external / fftpack / fftpack5 / r1f4kb.F
blob45474367d9570bc3e8a81696fc19bc345fe1ddd8
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: r1f4kb.f,v 1.2 2004/06/15 21:29:20 rodney Exp $                
11 !                                                                       
12 !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
13                                                                         
14       SUBROUTINE R1F4KB (IDO,L1,CC,IN1,CH,IN2,WA1,WA2,WA3) 
15       REAL       CC(IN1,IDO,4,L1)  ,CH(IN2,IDO,L1,4)    ,               &
16      &           WA1(IDO)  ,        WA2(IDO)  ,       WA3(IDO)          
17 !                                                                       
18       SQRT2=SQRT(2.) 
19       DO 101 K=1,L1 
20          CH(1,1,K,3) = (CC(1,1,1,K)+CC(1,IDO,4,K))                      &
21      &   -(CC(1,IDO,2,K)+CC(1,IDO,2,K))                                 
22          CH(1,1,K,1) = (CC(1,1,1,K)+CC(1,IDO,4,K))                      &
23      &   +(CC(1,IDO,2,K)+CC(1,IDO,2,K))                                 
24          CH(1,1,K,4) = (CC(1,1,1,K)-CC(1,IDO,4,K))                      &
25      &   +(CC(1,1,3,K)+CC(1,1,3,K))                                     
26          CH(1,1,K,2) = (CC(1,1,1,K)-CC(1,IDO,4,K))                      &
27      &   -(CC(1,1,3,K)+CC(1,1,3,K))                                     
28   101 END DO 
29       IF (IDO-2) 107,105,102 
30   102 IDP2 = IDO+2 
31       DO 104 K=1,L1 
32          DO 103 I=3,IDO,2 
33             IC = IDP2-I 
34         CH(1,I-1,K,1) = (CC(1,I-1,1,K)+CC(1,IC-1,4,K))                  &
35      &  +(CC(1,I-1,3,K)+CC(1,IC-1,2,K))                                 
36         CH(1,I,K,1) = (CC(1,I,1,K)-CC(1,IC,4,K))                        &
37      &  +(CC(1,I,3,K)-CC(1,IC,2,K))                                     
38         CH(1,I-1,K,2)=WA1(I-2)*((CC(1,I-1,1,K)-CC(1,IC-1,4,K))          &
39      &  -(CC(1,I,3,K)+CC(1,IC,2,K)))-WA1(I-1)                           &
40      &  *((CC(1,I,1,K)+CC(1,IC,4,K))+(CC(1,I-1,3,K)-CC(1,IC-1,2,K)))    
41         CH(1,I,K,2)=WA1(I-2)*((CC(1,I,1,K)+CC(1,IC,4,K))                &
42      &  +(CC(1,I-1,3,K)-CC(1,IC-1,2,K)))+WA1(I-1)                       &
43      &  *((CC(1,I-1,1,K)-CC(1,IC-1,4,K))-(CC(1,I,3,K)+CC(1,IC,2,K)))    
44         CH(1,I-1,K,3)=WA2(I-2)*((CC(1,I-1,1,K)+CC(1,IC-1,4,K))          &
45      &  -(CC(1,I-1,3,K)+CC(1,IC-1,2,K)))-WA2(I-1)                       &
46      &  *((CC(1,I,1,K)-CC(1,IC,4,K))-(CC(1,I,3,K)-CC(1,IC,2,K)))        
47         CH(1,I,K,3)=WA2(I-2)*((CC(1,I,1,K)-CC(1,IC,4,K))                &
48      &  -(CC(1,I,3,K)-CC(1,IC,2,K)))+WA2(I-1)                           &
49      &  *((CC(1,I-1,1,K)+CC(1,IC-1,4,K))-(CC(1,I-1,3,K)                 &
50      &  +CC(1,IC-1,2,K)))                                               
51         CH(1,I-1,K,4)=WA3(I-2)*((CC(1,I-1,1,K)-CC(1,IC-1,4,K))          &
52      &  +(CC(1,I,3,K)+CC(1,IC,2,K)))-WA3(I-1)                           &
53      & *((CC(1,I,1,K)+CC(1,IC,4,K))-(CC(1,I-1,3,K)-CC(1,IC-1,2,K)))     
54         CH(1,I,K,4)=WA3(I-2)*((CC(1,I,1,K)+CC(1,IC,4,K))                &
55      &  -(CC(1,I-1,3,K)-CC(1,IC-1,2,K)))+WA3(I-1)                       &
56      &  *((CC(1,I-1,1,K)-CC(1,IC-1,4,K))+(CC(1,I,3,K)+CC(1,IC,2,K)))    
57   103    CONTINUE 
58   104 END DO 
59       IF (MOD(IDO,2) .EQ. 1) RETURN 
60   105 CONTINUE 
61       DO 106 K=1,L1 
62          CH(1,IDO,K,1) = (CC(1,IDO,1,K)+CC(1,IDO,3,K))                  &
63      &   +(CC(1,IDO,1,K)+CC(1,IDO,3,K))                                 
64          CH(1,IDO,K,2) = SQRT2*((CC(1,IDO,1,K)-CC(1,IDO,3,K))           &
65      &   -(CC(1,1,2,K)+CC(1,1,4,K)))                                    
66          CH(1,IDO,K,3) = (CC(1,1,4,K)-CC(1,1,2,K))                      &
67      &   +(CC(1,1,4,K)-CC(1,1,2,K))                                     
68          CH(1,IDO,K,4) = -SQRT2*((CC(1,IDO,1,K)-CC(1,IDO,3,K))          &
69      &   +(CC(1,1,2,K)+CC(1,1,4,K)))                                    
70   106 END DO 
71   107 RETURN 
72       END