/wrfv2_fire/external/fftpack/fftpack5/mradf3.F

!CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
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!   FFTPACK 5.0                                                         
!                                                                       
!   Authors:  Paul N. Swarztrauber and Richard A. Valent                
!                                                                       
!   $Id: mradf3.f,v 1.2 2004/06/15 21:29:20 rodney Exp $                
!                                                                       
!CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
                                                                        
      SUBROUTINE MRADF3 (M,IDO,L1,CC,IM1,IN1,CH,IM2,IN2,WA1,WA2) 
      REAL       CH(IN2,IDO,3,L1)  ,CC(IN1,IDO,L1,3)     ,              &
     &                WA1(IDO)     ,WA2(IDO)                            
!                                                                       
      M1D = (M-1)*IM1+1 
      M2S = 1-IM2 
      ARG=2.*4.*ATAN(1.0)/3. 
      TAUR=COS(ARG) 
      TAUI=SIN(ARG) 
      DO 101 K=1,L1 
         M2 = M2S 
         DO 1001 M1=1,M1D,IM1 
         M2 = M2+IM2 
         CH(M2,1,1,K) = CC(M1,1,K,1)+(CC(M1,1,K,2)+CC(M1,1,K,3)) 
         CH(M2,1,3,K) = TAUI*(CC(M1,1,K,3)-CC(M1,1,K,2)) 
         CH(M2,IDO,2,K) = CC(M1,1,K,1)+TAUR*                            &
     &      (CC(M1,1,K,2)+CC(M1,1,K,3))                                 
 1001    CONTINUE 
  101 END DO 
      IF (IDO .EQ. 1) RETURN 
      IDP2 = IDO+2 
      DO 103 K=1,L1 
         DO 102 I=3,IDO,2 
            IC = IDP2-I 
            M2 = M2S 
            DO 1002 M1=1,M1D,IM1 
            M2 = M2+IM2 
            CH(M2,I-1,1,K) = CC(M1,I-1,K,1)+((WA1(I-2)*CC(M1,I-1,K,2)+  &
     &       WA1(I-1)*CC(M1,I,K,2))+(WA2(I-2)*CC(M1,I-1,K,3)+WA2(I-1)*  &
     &       CC(M1,I,K,3)))                                             
            CH(M2,I,1,K) = CC(M1,I,K,1)+((WA1(I-2)*CC(M1,I,K,2)-        &
     &       WA1(I-1)*CC(M1,I-1,K,2))+(WA2(I-2)*CC(M1,I,K,3)-WA2(I-1)*  &
     &       CC(M1,I-1,K,3)))                                           
            CH(M2,I-1,3,K) = (CC(M1,I-1,K,1)+TAUR*((WA1(I-2)*           &
     &       CC(M1,I-1,K,2)+WA1(I-1)*CC(M1,I,K,2))+(WA2(I-2)*           &
     &       CC(M1,I-1,K,3)+WA2(I-1)*CC(M1,I,K,3))))+(TAUI*((WA1(I-2)*  &
     &       CC(M1,I,K,2)-WA1(I-1)*CC(M1,I-1,K,2))-(WA2(I-2)*           &
     &       CC(M1,I,K,3)-WA2(I-1)*CC(M1,I-1,K,3))))                    
            CH(M2,IC-1,2,K) = (CC(M1,I-1,K,1)+TAUR*((WA1(I-2)*          &
     &       CC(M1,I-1,K,2)+WA1(I-1)*CC(M1,I,K,2))+(WA2(I-2)*           &
     &       CC(M1,I-1,K,3)+WA2(I-1)*CC(M1,I,K,3))))-(TAUI*((WA1(I-2)*  &
     &       CC(M1,I,K,2)-WA1(I-1)*CC(M1,I-1,K,2))-(WA2(I-2)*           &
     &       CC(M1,I,K,3)-WA2(I-1)*CC(M1,I-1,K,3))))                    
            CH(M2,I,3,K) = (CC(M1,I,K,1)+TAUR*((WA1(I-2)*CC(M1,I,K,2)-  &
     &       WA1(I-1)*CC(M1,I-1,K,2))+(WA2(I-2)*CC(M1,I,K,3)-WA2(I-1)*  &
     &       CC(M1,I-1,K,3))))+(TAUI*((WA2(I-2)*CC(M1,I-1,K,3)+WA2(I-1)*&
     &       CC(M1,I,K,3))-(WA1(I-2)*CC(M1,I-1,K,2)+WA1(I-1)*           &
     &       CC(M1,I,K,2))))                                            
            CH(M2,IC,2,K) = (TAUI*((WA2(I-2)*CC(M1,I-1,K,3)+WA2(I-1)*   &
     &       CC(M1,I,K,3))-(WA1(I-2)*CC(M1,I-1,K,2)+WA1(I-1)*           &
     &       CC(M1,I,K,2))))-(CC(M1,I,K,1)+TAUR*((WA1(I-2)*CC(M1,I,K,2)-&
     &       WA1(I-1)*CC(M1,I-1,K,2))+(WA2(I-2)*CC(M1,I,K,3)-WA2(I-1)*  &
     &       CC(M1,I-1,K,3))))                                          
 1002       CONTINUE 
  102    CONTINUE 
  103 END DO 
      RETURN 
      END