share/fftpack5/fortran/cmf2kb.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 CMF2KB (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 .OR. NA.EQ.1) GO TO 102
  17       DO 101 K=1,L1
  18          DO 101 M1=1,M1D,IM1
  19          CHOLD1 = CC(1,M1,K,1,1)+CC(1,M1,K,1,2)
  20          CC(1,M1,K,1,2) = CC(1,M1,K,1,1)-CC(1,M1,K,1,2)
  21          CC(1,M1,K,1,1) = CHOLD1
  22          CHOLD2 = CC(2,M1,K,1,1)+CC(2,M1,K,1,2)
  23          CC(2,M1,K,1,2) = CC(2,M1,K,1,1)-CC(2,M1,K,1,2)
  24          CC(2,M1,K,1,1) = CHOLD2
  25   101 CONTINUE
  26       RETURN
  27   102 DO 103 K=1,L1
  28          M2 = M2S
  29          DO 103 M1=1,M1D,IM1
  30          M2 = M2+IM2
  31          CH(1,M2,K,1,1) = CC(1,M1,K,1,1)+CC(1,M1,K,1,2)
  32          CH(1,M2,K,2,1) = CC(1,M1,K,1,1)-CC(1,M1,K,1,2)
  33          CH(2,M2,K,1,1) = CC(2,M1,K,1,1)+CC(2,M1,K,1,2)
  34          CH(2,M2,K,2,1) = CC(2,M1,K,1,1)-CC(2,M1,K,1,2)
  35   103 CONTINUE
  36       IF(IDO .EQ. 1) RETURN
  37       DO 105 I=2,IDO
  38          DO 104 K=1,L1
  39          M2 = M2S
  40          DO 104 M1=1,M1D,IM1
  41          M2 = M2+IM2
  42             CH(1,M2,K,1,I) = CC(1,M1,K,I,1)+CC(1,M1,K,I,2)
  43             TR2 = CC(1,M1,K,I,1)-CC(1,M1,K,I,2)
  44             CH(2,M2,K,1,I) = CC(2,M1,K,I,1)+CC(2,M1,K,I,2)
  45             TI2 = CC(2,M1,K,I,1)-CC(2,M1,K,I,2)
  46             CH(2,M2,K,2,I) = WA(I,1,1)*TI2+WA(I,1,2)*TR2
  47             CH(1,M2,K,2,I) = WA(I,1,1)*TR2-WA(I,1,2)*TI2
  48   104    CONTINUE
  49   105 CONTINUE
  50       RETURN
  51       END