share/fftpack5/fortran/cmf2kf.f

   1 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
   2 C
   3 C   FFTPACK 5.0
   4 C
   5 C   Authors:  Paul N. Swarztrauber and Richard A. Valent
   6 C
   7 C   $Id$
   8 C
   9 CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
  10
  11       SUBROUTINE CMF2KF (LOT,IDO,L1,NA,CC,IM1,IN1,CH,IM2,IN2,WA)
  12       REAL  CC(2,IN1,L1,IDO,2),CH(2,IN2,L1,2,IDO),WA(IDO,1,2)
  13 C
  14       M1D = (LOT-1)*IM1+1
  15       M2S = 1-IM2
  16       IF (IDO .GT. 1) GO TO 102
  17       SN = 1./REAL(2*L1)
  18       IF (NA .EQ. 1) GO TO 106
  19       DO 101 K=1,L1
  20          DO 101 M1=1,M1D,IM1
  21          CHOLD1 = SN*(CC(1,M1,K,1,1)+CC(1,M1,K,1,2))
  22          CC(1,M1,K,1,2) = SN*(CC(1,M1,K,1,1)-CC(1,M1,K,1,2))
  23          CC(1,M1,K,1,1) = CHOLD1
  24          CHOLD2 = SN*(CC(2,M1,K,1,1)+CC(2,M1,K,1,2))
  25          CC(2,M1,K,1,2) = SN*(CC(2,M1,K,1,1)-CC(2,M1,K,1,2))
  26          CC(2,M1,K,1,1) = CHOLD2
  27   101 CONTINUE
  28       RETURN
  29   106 DO 107 K=1,L1
  30          M2 = M2S
  31          DO 107 M1=1,M1D,IM1
  32          M2 = M2+IM2
  33          CH(1,M2,K,1,1) = SN*(CC(1,M1,K,1,1)+CC(1,M1,K,1,2))
  34          CH(1,M2,K,2,1) = SN*(CC(1,M1,K,1,1)-CC(1,M1,K,1,2))
  35          CH(2,M2,K,1,1) = SN*(CC(2,M1,K,1,1)+CC(2,M1,K,1,2))
  36          CH(2,M2,K,2,1) = SN*(CC(2,M1,K,1,1)-CC(2,M1,K,1,2))
  37   107 CONTINUE
  38       RETURN
  39   102 DO 103 K=1,L1
  40          M2 = M2S
  41          DO 103 M1=1,M1D,IM1
  42          M2 = M2+IM2
  43          CH(1,M2,K,1,1) = CC(1,M1,K,1,1)+CC(1,M1,K,1,2)
  44          CH(1,M2,K,2,1) = CC(1,M1,K,1,1)-CC(1,M1,K,1,2)
  45          CH(2,M2,K,1,1) = CC(2,M1,K,1,1)+CC(2,M1,K,1,2)
  46          CH(2,M2,K,2,1) = CC(2,M1,K,1,1)-CC(2,M1,K,1,2)
  47   103 CONTINUE
  48       DO 105 I=2,IDO
  49          DO 104 K=1,L1
  50          M2 = M2S
  51          DO 104 M1=1,M1D,IM1
  52          M2 = M2+IM2
  53             CH(1,M2,K,1,I) = CC(1,M1,K,I,1)+CC(1,M1,K,I,2)
  54             TR2 = CC(1,M1,K,I,1)-CC(1,M1,K,I,2)
  55             CH(2,M2,K,1,I) = CC(2,M1,K,I,1)+CC(2,M1,K,I,2)
  56             TI2 = CC(2,M1,K,I,1)-CC(2,M1,K,I,2)
  57             CH(2,M2,K,2,I) = WA(I,1,1)*TI2-WA(I,1,2)*TR2
  58             CH(1,M2,K,2,I) = WA(I,1,1)*TR2+WA(I,1,2)*TI2
  59   104    CONTINUE
  60   105 CONTINUE
  61       RETURN
  62       END