share/fftpack5/fortran/cmf3kb.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 CMF3KB (LOT,IDO,L1,NA,CC,IM1,IN1,CH,IM2,IN2,WA)
  12       REAL  CC(2,IN1,L1,IDO,3),CH(2,IN2,L1,3,IDO),WA(IDO,2,2)
  13       DATA TAUR,TAUI /-.5,.866025403784439/
  14 C
  15       M1D = (LOT-1)*IM1+1
  16       M2S = 1-IM2
  17       IF (IDO.GT.1 .OR. NA.EQ.1) GO TO 102
  18       DO 101 K=1,L1
  19          DO 101 M1=1,M1D,IM1
  20          TR2 = CC(1,M1,K,1,2)+CC(1,M1,K,1,3)
  21          CR2 = CC(1,M1,K,1,1)+TAUR*TR2
  22          CC(1,M1,K,1,1) = CC(1,M1,K,1,1)+TR2
  23          TI2 = CC(2,M1,K,1,2)+CC(2,M1,K,1,3)
  24          CI2 = CC(2,M1,K,1,1)+TAUR*TI2
  25          CC(2,M1,K,1,1) = CC(2,M1,K,1,1)+TI2
  26          CR3 = TAUI*(CC(1,M1,K,1,2)-CC(1,M1,K,1,3))
  27          CI3 = TAUI*(CC(2,M1,K,1,2)-CC(2,M1,K,1,3))
  28          CC(1,M1,K,1,2) = CR2-CI3
  29          CC(1,M1,K,1,3) = CR2+CI3
  30          CC(2,M1,K,1,2) = CI2+CR3
  31          CC(2,M1,K,1,3) = CI2-CR3
  32   101 CONTINUE
  33       RETURN
  34   102 DO 103 K=1,L1
  35          M2 = M2S
  36          DO 103 M1=1,M1D,IM1
  37          M2 = M2+IM2
  38          TR2 = CC(1,M1,K,1,2)+CC(1,M1,K,1,3)
  39          CR2 = CC(1,M1,K,1,1)+TAUR*TR2
  40          CH(1,M2,K,1,1) = CC(1,M1,K,1,1)+TR2
  41          TI2 = CC(2,M1,K,1,2)+CC(2,M1,K,1,3)
  42          CI2 = CC(2,M1,K,1,1)+TAUR*TI2
  43          CH(2,M2,K,1,1) = CC(2,M1,K,1,1)+TI2
  44          CR3 = TAUI*(CC(1,M1,K,1,2)-CC(1,M1,K,1,3))
  45          CI3 = TAUI*(CC(2,M1,K,1,2)-CC(2,M1,K,1,3))
  46          CH(1,M2,K,2,1) = CR2-CI3
  47          CH(1,M2,K,3,1) = CR2+CI3
  48          CH(2,M2,K,2,1) = CI2+CR3
  49          CH(2,M2,K,3,1) = CI2-CR3
  50   103 CONTINUE
  51       IF (IDO .EQ. 1) RETURN
  52       DO 105 I=2,IDO
  53         DO 104 K=1,L1
  54          M2 = M2S
  55          DO 104 M1=1,M1D,IM1
  56          M2 = M2+IM2
  57             TR2 = CC(1,M1,K,I,2)+CC(1,M1,K,I,3)
  58             CR2 = CC(1,M1,K,I,1)+TAUR*TR2
  59             CH(1,M2,K,1,I) = CC(1,M1,K,I,1)+TR2
  60             TI2 = CC(2,M1,K,I,2)+CC(2,M1,K,I,3)
  61             CI2 = CC(2,M1,K,I,1)+TAUR*TI2
  62             CH(2,M2,K,1,I) = CC(2,M1,K,I,1)+TI2
  63             CR3 = TAUI*(CC(1,M1,K,I,2)-CC(1,M1,K,I,3))
  64             CI3 = TAUI*(CC(2,M1,K,I,2)-CC(2,M1,K,I,3))
  65             DR2 = CR2-CI3
  66             DR3 = CR2+CI3
  67             DI2 = CI2+CR3
  68             DI3 = CI2-CR3
  69             CH(2,M2,K,2,I) = WA(I,1,1)*DI2+WA(I,1,2)*DR2
  70             CH(1,M2,K,2,I) = WA(I,1,1)*DR2-WA(I,1,2)*DI2
  71             CH(2,M2,K,3,I) = WA(I,2,1)*DI3+WA(I,2,2)*DR3
  72             CH(1,M2,K,3,I) = WA(I,2,1)*DR3-WA(I,2,2)*DI3
  73   104    CONTINUE
  74   105 CONTINUE
  75       RETURN
  76       END