share/fftpack5/fortran/c1f4kb.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 C1F4KB (IDO,L1,NA,CC,IN1,CH,IN2,WA)
  12       REAL CC(IN1,L1,IDO,4),CH(IN2,L1,4,IDO),WA(IDO,3,2)
  13 C
  14 C FFTPACK 5.0 auxiliary routine
  15 C
  16       IF (IDO.GT.1 .OR. NA.EQ.1) GO TO 102
  17       DO 101 K=1,L1
  18          TI1 = CC(2,K,1,1)-CC(2,K,1,3)
  19          TI2 = CC(2,K,1,1)+CC(2,K,1,3)
  20          TR4 = CC(2,K,1,4)-CC(2,K,1,2)
  21          TI3 = CC(2,K,1,2)+CC(2,K,1,4)
  22          TR1 = CC(1,K,1,1)-CC(1,K,1,3)
  23          TR2 = CC(1,K,1,1)+CC(1,K,1,3)
  24          TI4 = CC(1,K,1,2)-CC(1,K,1,4)
  25          TR3 = CC(1,K,1,2)+CC(1,K,1,4)
  26          CC(1,K,1,1) = TR2+TR3
  27          CC(1,K,1,3) = TR2-TR3
  28          CC(2,K,1,1) = TI2+TI3
  29          CC(2,K,1,3) = TI2-TI3
  30          CC(1,K,1,2) = TR1+TR4
  31          CC(1,K,1,4) = TR1-TR4
  32          CC(2,K,1,2) = TI1+TI4
  33          CC(2,K,1,4) = TI1-TI4
  34   101 CONTINUE
  35       RETURN
  36   102 DO 103 K=1,L1
  37          TI1 = CC(2,K,1,1)-CC(2,K,1,3)
  38          TI2 = CC(2,K,1,1)+CC(2,K,1,3)
  39          TR4 = CC(2,K,1,4)-CC(2,K,1,2)
  40          TI3 = CC(2,K,1,2)+CC(2,K,1,4)
  41          TR1 = CC(1,K,1,1)-CC(1,K,1,3)
  42          TR2 = CC(1,K,1,1)+CC(1,K,1,3)
  43          TI4 = CC(1,K,1,2)-CC(1,K,1,4)
  44          TR3 = CC(1,K,1,2)+CC(1,K,1,4)
  45          CH(1,K,1,1) = TR2+TR3
  46          CH(1,K,3,1) = TR2-TR3
  47          CH(2,K,1,1) = TI2+TI3
  48          CH(2,K,3,1) = TI2-TI3
  49          CH(1,K,2,1) = TR1+TR4
  50          CH(1,K,4,1) = TR1-TR4
  51          CH(2,K,2,1) = TI1+TI4
  52          CH(2,K,4,1) = TI1-TI4
  53   103 CONTINUE
  54       IF(IDO .EQ. 1) RETURN
  55       DO 105 I=2,IDO
  56          DO 104 K=1,L1
  57             TI1 = CC(2,K,I,1)-CC(2,K,I,3)
  58             TI2 = CC(2,K,I,1)+CC(2,K,I,3)
  59             TI3 = CC(2,K,I,2)+CC(2,K,I,4)
  60             TR4 = CC(2,K,I,4)-CC(2,K,I,2)
  61             TR1 = CC(1,K,I,1)-CC(1,K,I,3)
  62             TR2 = CC(1,K,I,1)+CC(1,K,I,3)
  63             TI4 = CC(1,K,I,2)-CC(1,K,I,4)
  64             TR3 = CC(1,K,I,2)+CC(1,K,I,4)
  65             CH(1,K,1,I) = TR2+TR3
  66             CR3 = TR2-TR3
  67             CH(2,K,1,I) = TI2+TI3
  68             CI3 = TI2-TI3
  69             CR2 = TR1+TR4
  70             CR4 = TR1-TR4
  71             CI2 = TI1+TI4
  72             CI4 = TI1-TI4
  73             CH(1,K,2,I) = WA(I,1,1)*CR2-WA(I,1,2)*CI2
  74             CH(2,K,2,I) = WA(I,1,1)*CI2+WA(I,1,2)*CR2
  75             CH(1,K,3,I) = WA(I,2,1)*CR3-WA(I,2,2)*CI3
  76             CH(2,K,3,I) = WA(I,2,1)*CI3+WA(I,2,2)*CR3
  77             CH(1,K,4,I) = WA(I,3,1)*CR4-WA(I,3,2)*CI4
  78             CH(2,K,4,I) = WA(I,3,1)*CI4+WA(I,3,2)*CR4
  79   104    CONTINUE
  80   105 CONTINUE
  81       RETURN
  82       END