Sources Esope | Cast3M

r1f3kf
C R1F3KF    SOURCE    BP208322  18/10/08    21:15:10     9952           
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
C
C   FFTPACK 5.1 
C
C   Authors:  Paul N. Swarztrauber and Richard A. Valent
C
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
 
      SUBROUTINE R1F3KF (IDO,L1,CC,IN1,CH,IN2,WA1,WA2)
      IMPLICIT INTEGER(I-N)
      IMPLICIT REAL*8(A-H,O-Z)
      REAL*8     CH(IN2,IDO,3,L1)  ,CC(IN1,IDO,L1,3)     ,
     1                WA1(IDO)     ,WA2(IDO)
C
      ARG=8.D0*ATAN(1.0D0)/3.D0
      TAUR=COS(ARG)
      TAUI=SIN(ARG)
      DO 101 K=1,L1
         CH(1,1,1,K) = CC(1,1,K,1)+(CC(1,1,K,2)+CC(1,1,K,3))
         CH(1,1,3,K) = TAUI*(CC(1,1,K,3)-CC(1,1,K,2))
         CH(1,IDO,2,K) = CC(1,1,K,1)+TAUR*
     1      (CC(1,1,K,2)+CC(1,1,K,3))
  101 CONTINUE
      IF (IDO .EQ. 1) RETURN
      IDP2 = IDO+2
      DO 103 K=1,L1
         DO 102 I=3,IDO,2
            IC = IDP2-I
            CH(1,I-1,1,K) = CC(1,I-1,K,1)+((WA1(I-2)*CC(1,I-1,K,2)+
     1       WA1(I-1)*CC(1,I,K,2))+(WA2(I-2)*CC(1,I-1,K,3)+WA2(I-1)*
     1       CC(1,I,K,3)))
            CH(1,I,1,K) = CC(1,I,K,1)+((WA1(I-2)*CC(1,I,K,2)-
     1       WA1(I-1)*CC(1,I-1,K,2))+(WA2(I-2)*CC(1,I,K,3)-WA2(I-1)*
     1       CC(1,I-1,K,3)))
            CH(1,I-1,3,K) = (CC(1,I-1,K,1)+TAUR*((WA1(I-2)*
     1       CC(1,I-1,K,2)+WA1(I-1)*CC(1,I,K,2))+(WA2(I-2)*
     1       CC(1,I-1,K,3)+WA2(I-1)*CC(1,I,K,3))))+(TAUI*((WA1(I-2)*
     1       CC(1,I,K,2)-WA1(I-1)*CC(1,I-1,K,2))-(WA2(I-2)*
     1       CC(1,I,K,3)-WA2(I-1)*CC(1,I-1,K,3))))
            CH(1,IC-1,2,K) = (CC(1,I-1,K,1)+TAUR*((WA1(I-2)*
     1       CC(1,I-1,K,2)+WA1(I-1)*CC(1,I,K,2))+(WA2(I-2)*
     1       CC(1,I-1,K,3)+WA2(I-1)*CC(1,I,K,3))))-(TAUI*((WA1(I-2)*
     1       CC(1,I,K,2)-WA1(I-1)*CC(1,I-1,K,2))-(WA2(I-2)*
     1       CC(1,I,K,3)-WA2(I-1)*CC(1,I-1,K,3))))
            CH(1,I,3,K) = (CC(1,I,K,1)+TAUR*((WA1(I-2)*CC(1,I,K,2)-
     1       WA1(I-1)*CC(1,I-1,K,2))+(WA2(I-2)*CC(1,I,K,3)-WA2(I-1)*
     1       CC(1,I-1,K,3))))+(TAUI*((WA2(I-2)*CC(1,I-1,K,3)+WA2(I-1)*
     1       CC(1,I,K,3))-(WA1(I-2)*CC(1,I-1,K,2)+WA1(I-1)*
     1       CC(1,I,K,2))))
            CH(1,IC,2,K) = (TAUI*((WA2(I-2)*CC(1,I-1,K,3)+WA2(I-1)*
     1       CC(1,I,K,3))-(WA1(I-2)*CC(1,I-1,K,2)+WA1(I-1)*
     1       CC(1,I,K,2))))-(CC(1,I,K,1)+TAUR*((WA1(I-2)*CC(1,I,K,2)-
     1       WA1(I-1)*CC(1,I-1,K,2))+(WA2(I-2)*CC(1,I,K,3)-WA2(I-1)*
     1       CC(1,I-1,K,3))))
  102    CONTINUE
  103 CONTINUE
      RETURN
      END