share/fftpack5/fortran/cmf4kb.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 CMF4KB (LOT,IDO,L1,NA,CC,IM1,IN1,CH,IM2,IN2,WA)
  12       REAL CC(2,IN1,L1,IDO,4),CH(2,IN2,L1,4,IDO),WA(IDO,3,2)
  13 C
  14 C FFTPACK 5.0 auxiliary routine
  15 C
  16       M1D = (LOT-1)*IM1+1
  17       M2S = 1-IM2
  18       IF (IDO.GT.1 .OR. NA.EQ.1) GO TO 102
  19       DO 101 K=1,L1
  20          DO 101 M1=1,M1D,IM1
  21          TI1 = CC(2,M1,K,1,1)-CC(2,M1,K,1,3)
  22          TI2 = CC(2,M1,K,1,1)+CC(2,M1,K,1,3)
  23          TR4 = CC(2,M1,K,1,4)-CC(2,M1,K,1,2)
  24          TI3 = CC(2,M1,K,1,2)+CC(2,M1,K,1,4)
  25          TR1 = CC(1,M1,K,1,1)-CC(1,M1,K,1,3)
  26          TR2 = CC(1,M1,K,1,1)+CC(1,M1,K,1,3)
  27          TI4 = CC(1,M1,K,1,2)-CC(1,M1,K,1,4)
  28          TR3 = CC(1,M1,K,1,2)+CC(1,M1,K,1,4)
  29          CC(1,M1,K,1,1) = TR2+TR3
  30          CC(1,M1,K,1,3) = TR2-TR3
  31          CC(2,M1,K,1,1) = TI2+TI3
  32          CC(2,M1,K,1,3) = TI2-TI3
  33          CC(1,M1,K,1,2) = TR1+TR4
  34          CC(1,M1,K,1,4) = TR1-TR4
  35          CC(2,M1,K,1,2) = TI1+TI4
  36          CC(2,M1,K,1,4) = TI1-TI4
  37   101 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          TI1 = CC(2,M1,K,1,1)-CC(2,M1,K,1,3)
  44          TI2 = CC(2,M1,K,1,1)+CC(2,M1,K,1,3)
  45          TR4 = CC(2,M1,K,1,4)-CC(2,M1,K,1,2)
  46          TI3 = CC(2,M1,K,1,2)+CC(2,M1,K,1,4)
  47          TR1 = CC(1,M1,K,1,1)-CC(1,M1,K,1,3)
  48          TR2 = CC(1,M1,K,1,1)+CC(1,M1,K,1,3)
  49          TI4 = CC(1,M1,K,1,2)-CC(1,M1,K,1,4)
  50          TR3 = CC(1,M1,K,1,2)+CC(1,M1,K,1,4)
  51          CH(1,M2,K,1,1) = TR2+TR3
  52          CH(1,M2,K,3,1) = TR2-TR3
  53          CH(2,M2,K,1,1) = TI2+TI3
  54          CH(2,M2,K,3,1) = TI2-TI3
  55          CH(1,M2,K,2,1) = TR1+TR4
  56          CH(1,M2,K,4,1) = TR1-TR4
  57          CH(2,M2,K,2,1) = TI1+TI4
  58          CH(2,M2,K,4,1) = TI1-TI4
  59   103 CONTINUE
  60       IF(IDO .EQ. 1) RETURN
  61       DO 105 I=2,IDO
  62          DO 104 K=1,L1
  63          M2 = M2S
  64          DO 104 M1=1,M1D,IM1
  65          M2 = M2+IM2
  66             TI1 = CC(2,M1,K,I,1)-CC(2,M1,K,I,3)
  67             TI2 = CC(2,M1,K,I,1)+CC(2,M1,K,I,3)
  68             TI3 = CC(2,M1,K,I,2)+CC(2,M1,K,I,4)
  69             TR4 = CC(2,M1,K,I,4)-CC(2,M1,K,I,2)
  70             TR1 = CC(1,M1,K,I,1)-CC(1,M1,K,I,3)
  71             TR2 = CC(1,M1,K,I,1)+CC(1,M1,K,I,3)
  72             TI4 = CC(1,M1,K,I,2)-CC(1,M1,K,I,4)
  73             TR3 = CC(1,M1,K,I,2)+CC(1,M1,K,I,4)
  74             CH(1,M2,K,1,I) = TR2+TR3
  75             CR3 = TR2-TR3
  76             CH(2,M2,K,1,I) = TI2+TI3
  77             CI3 = TI2-TI3
  78             CR2 = TR1+TR4
  79             CR4 = TR1-TR4
  80             CI2 = TI1+TI4
  81             CI4 = TI1-TI4
  82             CH(1,M2,K,2,I) = WA(I,1,1)*CR2-WA(I,1,2)*CI2
  83             CH(2,M2,K,2,I) = WA(I,1,1)*CI2+WA(I,1,2)*CR2
  84             CH(1,M2,K,3,I) = WA(I,2,1)*CR3-WA(I,2,2)*CI3
  85             CH(2,M2,K,3,I) = WA(I,2,1)*CI3+WA(I,2,2)*CR3
  86             CH(1,M2,K,4,I) = WA(I,3,1)*CR4-WA(I,3,2)*CI4
  87             CH(2,M2,K,4,I) = WA(I,3,1)*CI4+WA(I,3,2)*CR4
  88   104    CONTINUE
  89   105 CONTINUE
  90       RETURN
  91       END