share/fftpack5/fortran/cmf4kf.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 CMF4KF (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) GO TO 102
  19       SN = 1./REAL(4*L1)
  20       IF (NA .EQ. 1) GO TO 106
  21       DO 101 K=1,L1
  22          DO 101 M1=1,M1D,IM1
  23          TI1 = CC(2,M1,K,1,1)-CC(2,M1,K,1,3)
  24          TI2 = CC(2,M1,K,1,1)+CC(2,M1,K,1,3)
  25          TR4 = CC(2,M1,K,1,2)-CC(2,M1,K,1,4)
  26          TI3 = CC(2,M1,K,1,2)+CC(2,M1,K,1,4)
  27          TR1 = CC(1,M1,K,1,1)-CC(1,M1,K,1,3)
  28          TR2 = CC(1,M1,K,1,1)+CC(1,M1,K,1,3)
  29          TI4 = CC(1,M1,K,1,4)-CC(1,M1,K,1,2)
  30          TR3 = CC(1,M1,K,1,2)+CC(1,M1,K,1,4)
  31          CC(1,M1,K,1,1) = SN*(TR2+TR3)
  32          CC(1,M1,K,1,3) = SN*(TR2-TR3)
  33          CC(2,M1,K,1,1) = SN*(TI2+TI3)
  34          CC(2,M1,K,1,3) = SN*(TI2-TI3)
  35          CC(1,M1,K,1,2) = SN*(TR1+TR4)
  36          CC(1,M1,K,1,4) = SN*(TR1-TR4)
  37          CC(2,M1,K,1,2) = SN*(TI1+TI4)
  38          CC(2,M1,K,1,4) = SN*(TI1-TI4)
  39   101 CONTINUE
  40       RETURN
  41   106 DO 107 K=1,L1
  42          M2 = M2S
  43          DO 107 M1=1,M1D,IM1
  44          M2 = M2+IM2
  45          TI1 = CC(2,M1,K,1,1)-CC(2,M1,K,1,3)
  46          TI2 = CC(2,M1,K,1,1)+CC(2,M1,K,1,3)
  47          TR4 = CC(2,M1,K,1,2)-CC(2,M1,K,1,4)
  48          TI3 = CC(2,M1,K,1,2)+CC(2,M1,K,1,4)
  49          TR1 = CC(1,M1,K,1,1)-CC(1,M1,K,1,3)
  50          TR2 = CC(1,M1,K,1,1)+CC(1,M1,K,1,3)
  51          TI4 = CC(1,M1,K,1,4)-CC(1,M1,K,1,2)
  52          TR3 = CC(1,M1,K,1,2)+CC(1,M1,K,1,4)
  53          CH(1,M2,K,1,1) = SN*(TR2+TR3)
  54          CH(1,M2,K,3,1) = SN*(TR2-TR3)
  55          CH(2,M2,K,1,1) = SN*(TI2+TI3)
  56          CH(2,M2,K,3,1) = SN*(TI2-TI3)
  57          CH(1,M2,K,2,1) = SN*(TR1+TR4)
  58          CH(1,M2,K,4,1) = SN*(TR1-TR4)
  59          CH(2,M2,K,2,1) = SN*(TI1+TI4)
  60          CH(2,M2,K,4,1) = SN*(TI1-TI4)
  61   107 CONTINUE
  62       RETURN
  63   102 DO 103 K=1,L1
  64          M2 = M2S
  65          DO 103 M1=1,M1D,IM1
  66          M2 = M2+IM2
  67          TI1 = CC(2,M1,K,1,1)-CC(2,M1,K,1,3)
  68          TI2 = CC(2,M1,K,1,1)+CC(2,M1,K,1,3)
  69          TR4 = CC(2,M1,K,1,2)-CC(2,M1,K,1,4)
  70          TI3 = CC(2,M1,K,1,2)+CC(2,M1,K,1,4)
  71          TR1 = CC(1,M1,K,1,1)-CC(1,M1,K,1,3)
  72          TR2 = CC(1,M1,K,1,1)+CC(1,M1,K,1,3)
  73          TI4 = CC(1,M1,K,1,4)-CC(1,M1,K,1,2)
  74          TR3 = CC(1,M1,K,1,2)+CC(1,M1,K,1,4)
  75          CH(1,M2,K,1,1) = TR2+TR3
  76          CH(1,M2,K,3,1) = TR2-TR3
  77          CH(2,M2,K,1,1) = TI2+TI3
  78          CH(2,M2,K,3,1) = TI2-TI3
  79          CH(1,M2,K,2,1) = TR1+TR4
  80          CH(1,M2,K,4,1) = TR1-TR4
  81          CH(2,M2,K,2,1) = TI1+TI4
  82          CH(2,M2,K,4,1) = TI1-TI4
  83   103 CONTINUE
  84       DO 105 I=2,IDO
  85          DO 104 K=1,L1
  86          M2 = M2S
  87          DO 104 M1=1,M1D,IM1
  88          M2 = M2+IM2
  89             TI1 = CC(2,M1,K,I,1)-CC(2,M1,K,I,3)
  90             TI2 = CC(2,M1,K,I,1)+CC(2,M1,K,I,3)
  91             TI3 = CC(2,M1,K,I,2)+CC(2,M1,K,I,4)
  92             TR4 = CC(2,M1,K,I,2)-CC(2,M1,K,I,4)
  93             TR1 = CC(1,M1,K,I,1)-CC(1,M1,K,I,3)
  94             TR2 = CC(1,M1,K,I,1)+CC(1,M1,K,I,3)
  95             TI4 = CC(1,M1,K,I,4)-CC(1,M1,K,I,2)
  96             TR3 = CC(1,M1,K,I,2)+CC(1,M1,K,I,4)
  97             CH(1,M2,K,1,I) = TR2+TR3
  98             CR3 = TR2-TR3
  99             CH(2,M2,K,1,I) = TI2+TI3
 100             CI3 = TI2-TI3
 101             CR2 = TR1+TR4
 102             CR4 = TR1-TR4
 103             CI2 = TI1+TI4
 104             CI4 = TI1-TI4
 105             CH(1,M2,K,2,I) = WA(I,1,1)*CR2+WA(I,1,2)*CI2
 106             CH(2,M2,K,2,I) = WA(I,1,1)*CI2-WA(I,1,2)*CR2
 107             CH(1,M2,K,3,I) = WA(I,2,1)*CR3+WA(I,2,2)*CI3
 108             CH(2,M2,K,3,I) = WA(I,2,1)*CI3-WA(I,2,2)*CR3
 109             CH(1,M2,K,4,I) = WA(I,3,1)*CR4+WA(I,3,2)*CI4
 110             CH(2,M2,K,4,I) = WA(I,3,1)*CI4-WA(I,3,2)*CR4
 111   104    CONTINUE
 112   105 CONTINUE
 113       RETURN
 114       END