wrf-fire /wrfv2_fire/external/fftpack/fftpack5/r1f4kb.F

Language Fortran 77 Lines 70
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Repository git://github.com/jbeezley/wrf-fire.git View Raw File View Project SPDX
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!CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
!                                                                       
!   FFTPACK 5.0                                                         
!                                                                       
!   Authors:  Paul N. Swarztrauber and Richard A. Valent                
!                                                                       
!   $Id: r1f4kb.f,v 1.2 2004/06/15 21:29:20 rodney Exp $                
!                                                                       
!CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
                                                                        
      SUBROUTINE R1F4KB (IDO,L1,CC,IN1,CH,IN2,WA1,WA2,WA3) 
      REAL       CC(IN1,IDO,4,L1)  ,CH(IN2,IDO,L1,4)    ,               &
     &           WA1(IDO)  ,        WA2(IDO)  ,       WA3(IDO)          
!                                                                       
      SQRT2=SQRT(2.) 
      DO 101 K=1,L1 
         CH(1,1,K,3) = (CC(1,1,1,K)+CC(1,IDO,4,K))                      &
     &   -(CC(1,IDO,2,K)+CC(1,IDO,2,K))                                 
         CH(1,1,K,1) = (CC(1,1,1,K)+CC(1,IDO,4,K))                      &
     &   +(CC(1,IDO,2,K)+CC(1,IDO,2,K))                                 
         CH(1,1,K,4) = (CC(1,1,1,K)-CC(1,IDO,4,K))                      &
     &   +(CC(1,1,3,K)+CC(1,1,3,K))                                     
         CH(1,1,K,2) = (CC(1,1,1,K)-CC(1,IDO,4,K))                      &
     &   -(CC(1,1,3,K)+CC(1,1,3,K))                                     
  101 END DO 
      IF (IDO-2) 107,105,102 
  102 IDP2 = IDO+2 
      DO 104 K=1,L1 
         DO 103 I=3,IDO,2 
            IC = IDP2-I 
        CH(1,I-1,K,1) = (CC(1,I-1,1,K)+CC(1,IC-1,4,K))                  &
     &  +(CC(1,I-1,3,K)+CC(1,IC-1,2,K))                                 
        CH(1,I,K,1) = (CC(1,I,1,K)-CC(1,IC,4,K))                        &
     &  +(CC(1,I,3,K)-CC(1,IC,2,K))                                     
        CH(1,I-1,K,2)=WA1(I-2)*((CC(1,I-1,1,K)-CC(1,IC-1,4,K))          &
     &  -(CC(1,I,3,K)+CC(1,IC,2,K)))-WA1(I-1)                           &
     &  *((CC(1,I,1,K)+CC(1,IC,4,K))+(CC(1,I-1,3,K)-CC(1,IC-1,2,K)))    
        CH(1,I,K,2)=WA1(I-2)*((CC(1,I,1,K)+CC(1,IC,4,K))                &
     &  +(CC(1,I-1,3,K)-CC(1,IC-1,2,K)))+WA1(I-1)                       &
     &  *((CC(1,I-1,1,K)-CC(1,IC-1,4,K))-(CC(1,I,3,K)+CC(1,IC,2,K)))    
        CH(1,I-1,K,3)=WA2(I-2)*((CC(1,I-1,1,K)+CC(1,IC-1,4,K))          &
     &  -(CC(1,I-1,3,K)+CC(1,IC-1,2,K)))-WA2(I-1)                       &
     &  *((CC(1,I,1,K)-CC(1,IC,4,K))-(CC(1,I,3,K)-CC(1,IC,2,K)))        
        CH(1,I,K,3)=WA2(I-2)*((CC(1,I,1,K)-CC(1,IC,4,K))                &
     &  -(CC(1,I,3,K)-CC(1,IC,2,K)))+WA2(I-1)                           &
     &  *((CC(1,I-1,1,K)+CC(1,IC-1,4,K))-(CC(1,I-1,3,K)                 &
     &  +CC(1,IC-1,2,K)))                                               
        CH(1,I-1,K,4)=WA3(I-2)*((CC(1,I-1,1,K)-CC(1,IC-1,4,K))          &
     &  +(CC(1,I,3,K)+CC(1,IC,2,K)))-WA3(I-1)                           &
     & *((CC(1,I,1,K)+CC(1,IC,4,K))-(CC(1,I-1,3,K)-CC(1,IC-1,2,K)))     
        CH(1,I,K,4)=WA3(I-2)*((CC(1,I,1,K)+CC(1,IC,4,K))                &
     &  -(CC(1,I-1,3,K)-CC(1,IC-1,2,K)))+WA3(I-1)                       &
     &  *((CC(1,I-1,1,K)-CC(1,IC-1,4,K))+(CC(1,I,3,K)+CC(1,IC,2,K)))    
  103    CONTINUE 
  104 END DO 
      IF (MOD(IDO,2) .EQ. 1) RETURN 
  105 CONTINUE 
      DO 106 K=1,L1 
         CH(1,IDO,K,1) = (CC(1,IDO,1,K)+CC(1,IDO,3,K))                  &
     &   +(CC(1,IDO,1,K)+CC(1,IDO,3,K))                                 
         CH(1,IDO,K,2) = SQRT2*((CC(1,IDO,1,K)-CC(1,IDO,3,K))           &
     &   -(CC(1,1,2,K)+CC(1,1,4,K)))                                    
         CH(1,IDO,K,3) = (CC(1,1,4,K)-CC(1,1,2,K))                      &
     &   +(CC(1,1,4,K)-CC(1,1,2,K))                                     
         CH(1,IDO,K,4) = -SQRT2*((CC(1,IDO,1,K)-CC(1,IDO,3,K))          &
     &   +(CC(1,1,2,K)+CC(1,1,4,K)))                                    
  106 END DO 
  107 RETURN 
      END                                           
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