share/fftpack5/fortran/cmf3kf.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 CMF3KF (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) GO TO 102
  18       SN = 1./REAL(3*L1)
  19       IF (NA .EQ. 1) GO TO 106
  20       DO 101 K=1,L1
  21          DO 101 M1=1,M1D,IM1
  22          TR2 = CC(1,M1,K,1,2)+CC(1,M1,K,1,3)
  23          CR2 = CC(1,M1,K,1,1)+TAUR*TR2
  24          CC(1,M1,K,1,1) = SN*(CC(1,M1,K,1,1)+TR2)
  25          TI2 = CC(2,M1,K,1,2)+CC(2,M1,K,1,3)
  26          CI2 = CC(2,M1,K,1,1)+TAUR*TI2
  27          CC(2,M1,K,1,1) = SN*(CC(2,M1,K,1,1)+TI2)
  28          CR3 = TAUI*(CC(1,M1,K,1,2)-CC(1,M1,K,1,3))
  29          CI3 = TAUI*(CC(2,M1,K,1,2)-CC(2,M1,K,1,3))
  30          CC(1,M1,K,1,2) = SN*(CR2-CI3)
  31          CC(1,M1,K,1,3) = SN*(CR2+CI3)
  32          CC(2,M1,K,1,2) = SN*(CI2+CR3)
  33          CC(2,M1,K,1,3) = SN*(CI2-CR3)
  34   101 CONTINUE
  35       RETURN
  36   106 DO 107 K=1,L1
  37          M2 = M2S
  38          DO 107 M1=1,M1D,IM1
  39          M2 = M2+IM2
  40          TR2 = CC(1,M1,K,1,2)+CC(1,M1,K,1,3)
  41          CR2 = CC(1,M1,K,1,1)+TAUR*TR2
  42          CH(1,M2,K,1,1) = SN*(CC(1,M1,K,1,1)+TR2)
  43          TI2 = CC(2,M1,K,1,2)+CC(2,M1,K,1,3)
  44          CI2 = CC(2,M1,K,1,1)+TAUR*TI2
  45          CH(2,M2,K,1,1) = SN*(CC(2,M1,K,1,1)+TI2)
  46          CR3 = TAUI*(CC(1,M1,K,1,2)-CC(1,M1,K,1,3))
  47          CI3 = TAUI*(CC(2,M1,K,1,2)-CC(2,M1,K,1,3))
  48          CH(1,M2,K,2,1) = SN*(CR2-CI3)
  49          CH(1,M2,K,3,1) = SN*(CR2+CI3)
  50          CH(2,M2,K,2,1) = SN*(CI2+CR3)
  51          CH(2,M2,K,3,1) = SN*(CI2-CR3)
  52   107 CONTINUE
  53       RETURN
  54   102 DO 103 K=1,L1
  55          M2 = M2S
  56          DO 103 M1=1,M1D,IM1
  57          M2 = M2+IM2
  58          TR2 = CC(1,M1,K,1,2)+CC(1,M1,K,1,3)
  59          CR2 = CC(1,M1,K,1,1)+TAUR*TR2
  60          CH(1,M2,K,1,1) = CC(1,M1,K,1,1)+TR2
  61          TI2 = CC(2,M1,K,1,2)+CC(2,M1,K,1,3)
  62          CI2 = CC(2,M1,K,1,1)+TAUR*TI2
  63          CH(2,M2,K,1,1) = CC(2,M1,K,1,1)+TI2
  64          CR3 = TAUI*(CC(1,M1,K,1,2)-CC(1,M1,K,1,3))
  65          CI3 = TAUI*(CC(2,M1,K,1,2)-CC(2,M1,K,1,3))
  66          CH(1,M2,K,2,1) = CR2-CI3
  67          CH(1,M2,K,3,1) = CR2+CI3
  68          CH(2,M2,K,2,1) = CI2+CR3
  69          CH(2,M2,K,3,1) = CI2-CR3
  70   103 CONTINUE
  71       DO 105 I=2,IDO
  72         DO 104 K=1,L1
  73          M2 = M2S
  74          DO 104 M1=1,M1D,IM1
  75          M2 = M2+IM2
  76             TR2 = CC(1,M1,K,I,2)+CC(1,M1,K,I,3)
  77             CR2 = CC(1,M1,K,I,1)+TAUR*TR2
  78             CH(1,M2,K,1,I) = CC(1,M1,K,I,1)+TR2
  79             TI2 = CC(2,M1,K,I,2)+CC(2,M1,K,I,3)
  80             CI2 = CC(2,M1,K,I,1)+TAUR*TI2
  81             CH(2,M2,K,1,I) = CC(2,M1,K,I,1)+TI2
  82             CR3 = TAUI*(CC(1,M1,K,I,2)-CC(1,M1,K,I,3))
  83             CI3 = TAUI*(CC(2,M1,K,I,2)-CC(2,M1,K,I,3))
  84             DR2 = CR2-CI3
  85             DR3 = CR2+CI3
  86             DI2 = CI2+CR3
  87             DI3 = CI2-CR3
  88             CH(2,M2,K,2,I) = WA(I,1,1)*DI2-WA(I,1,2)*DR2
  89             CH(1,M2,K,2,I) = WA(I,1,1)*DR2+WA(I,1,2)*DI2
  90             CH(2,M2,K,3,I) = WA(I,2,1)*DI3-WA(I,2,2)*DR3
  91             CH(1,M2,K,3,I) = WA(I,2,1)*DR3+WA(I,2,2)*DI3
  92   104    CONTINUE
  93   105 CONTINUE
  94       RETURN
  95       END