!CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
!                                                                       
!   FFTPACK 5.0                                                         
!                                                                       
!   Authors:  Paul N. Swarztrauber and Richard A. Valent                
!                                                                       
!   $Id: mradb2.f,v 1.2 2004/06/15 21:29:19 rodney Exp $                
!                                                                       
!CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
                                                                        
      SUBROUTINE MRADB2 (M,IDO,L1,CC,IM1,IN1,CH,IM2,IN2,WA1) 
      REAL       CC(IN1,IDO,2,L1), CH(IN2,IDO,L1,2), WA1(IDO) 
!                                                                       
      M1D = (M-1)*IM1+1 
      M2S = 1-IM2 
      DO 101 K=1,L1 
          M2 = M2S 
          DO 1001 M1=1,M1D,IM1 
          M2 = M2+IM2 
         CH(M2,1,K,1) = CC(M1,1,1,K)+CC(M1,IDO,2,K) 
         CH(M2,1,K,2) = CC(M1,1,1,K)-CC(M1,IDO,2,K) 
 1001     CONTINUE 
  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 
               M2 = M2S 
               DO 1002 M1=1,M1D,IM1 
               M2 = M2+IM2 
        CH(M2,I-1,K,1) = CC(M1,I-1,1,K)+CC(M1,IC-1,2,K) 
        CH(M2,I,K,1) = CC(M1,I,1,K)-CC(M1,IC,2,K) 
        CH(M2,I-1,K,2) = WA1(I-2)*(CC(M1,I-1,1,K)-CC(M1,IC-1,2,K))      &
     &  -WA1(I-1)*(CC(M1,I,1,K)+CC(M1,IC,2,K))                          
        CH(M2,I,K,2) = WA1(I-2)*(CC(M1,I,1,K)+CC(M1,IC,2,K))+WA1(I-1)   &
     &  *(CC(M1,I-1,1,K)-CC(M1,IC-1,2,K))                               
 1002          CONTINUE 
  103    CONTINUE 
  104 END DO 
      IF (MOD(IDO,2) .EQ. 1) RETURN 
  105 DO 106 K=1,L1 
          M2 = M2S 
          DO 1003 M1=1,M1D,IM1 
          M2 = M2+IM2 
         CH(M2,IDO,K,1) = CC(M1,IDO,1,K)+CC(M1,IDO,1,K) 
         CH(M2,IDO,K,2) = -(CC(M1,1,2,K)+CC(M1,1,2,K)) 
 1003     CONTINUE 
  106 END DO 
  107 RETURN 
      END