share/fftpack5/fortran/c1f3kf.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 C1F3KF (IDO,L1,NA,CC,IN1,CH,IN2,WA)
  12       REAL  CC(IN1,L1,IDO,3),CH(IN2,L1,3,IDO),WA(IDO,2,2)
  13       DATA TAUR,TAUI /-.5,-.866025403784439/
  14 C
  15       IF (IDO .GT. 1) GO TO 102
  16       SN = 1./REAL(3*L1)
  17       IF (NA .EQ. 1) GO TO 106
  18       DO 101 K=1,L1
  19          TR2 = CC(1,K,1,2)+CC(1,K,1,3)
  20          CR2 = CC(1,K,1,1)+TAUR*TR2
  21          CC(1,K,1,1) = SN*(CC(1,K,1,1)+TR2)
  22          TI2 = CC(2,K,1,2)+CC(2,K,1,3)
  23          CI2 = CC(2,K,1,1)+TAUR*TI2
  24          CC(2,K,1,1) = SN*(CC(2,K,1,1)+TI2)
  25          CR3 = TAUI*(CC(1,K,1,2)-CC(1,K,1,3))
  26          CI3 = TAUI*(CC(2,K,1,2)-CC(2,K,1,3))
  27          CC(1,K,1,2) = SN*(CR2-CI3)
  28          CC(1,K,1,3) = SN*(CR2+CI3)
  29          CC(2,K,1,2) = SN*(CI2+CR3)
  30          CC(2,K,1,3) = SN*(CI2-CR3)
  31   101 CONTINUE
  32       RETURN
  33   106 DO 107 K=1,L1
  34          TR2 = CC(1,K,1,2)+CC(1,K,1,3)
  35          CR2 = CC(1,K,1,1)+TAUR*TR2
  36          CH(1,K,1,1) = SN*(CC(1,K,1,1)+TR2)
  37          TI2 = CC(2,K,1,2)+CC(2,K,1,3)
  38          CI2 = CC(2,K,1,1)+TAUR*TI2
  39          CH(2,K,1,1) = SN*(CC(2,K,1,1)+TI2)
  40          CR3 = TAUI*(CC(1,K,1,2)-CC(1,K,1,3))
  41          CI3 = TAUI*(CC(2,K,1,2)-CC(2,K,1,3))
  42          CH(1,K,2,1) = SN*(CR2-CI3)
  43          CH(1,K,3,1) = SN*(CR2+CI3)
  44          CH(2,K,2,1) = SN*(CI2+CR3)
  45          CH(2,K,3,1) = SN*(CI2-CR3)
  46   107 CONTINUE
  47       RETURN
  48   102 DO 103 K=1,L1
  49          TR2 = CC(1,K,1,2)+CC(1,K,1,3)
  50          CR2 = CC(1,K,1,1)+TAUR*TR2
  51          CH(1,K,1,1) = CC(1,K,1,1)+TR2
  52          TI2 = CC(2,K,1,2)+CC(2,K,1,3)
  53          CI2 = CC(2,K,1,1)+TAUR*TI2
  54          CH(2,K,1,1) = CC(2,K,1,1)+TI2
  55          CR3 = TAUI*(CC(1,K,1,2)-CC(1,K,1,3))
  56          CI3 = TAUI*(CC(2,K,1,2)-CC(2,K,1,3))
  57          CH(1,K,2,1) = CR2-CI3
  58          CH(1,K,3,1) = CR2+CI3
  59          CH(2,K,2,1) = CI2+CR3
  60          CH(2,K,3,1) = CI2-CR3
  61   103 CONTINUE
  62       DO 105 I=2,IDO
  63         DO 104 K=1,L1
  64             TR2 = CC(1,K,I,2)+CC(1,K,I,3)
  65             CR2 = CC(1,K,I,1)+TAUR*TR2
  66             CH(1,K,1,I) = CC(1,K,I,1)+TR2
  67             TI2 = CC(2,K,I,2)+CC(2,K,I,3)
  68             CI2 = CC(2,K,I,1)+TAUR*TI2
  69             CH(2,K,1,I) = CC(2,K,I,1)+TI2
  70             CR3 = TAUI*(CC(1,K,I,2)-CC(1,K,I,3))
  71             CI3 = TAUI*(CC(2,K,I,2)-CC(2,K,I,3))
  72             DR2 = CR2-CI3
  73             DR3 = CR2+CI3
  74             DI2 = CI2+CR3
  75             DI3 = CI2-CR3
  76             CH(2,K,2,I) = WA(I,1,1)*DI2-WA(I,1,2)*DR2
  77             CH(1,K,2,I) = WA(I,1,1)*DR2+WA(I,1,2)*DI2
  78             CH(2,K,3,I) = WA(I,2,1)*DI3-WA(I,2,2)*DR3
  79             CH(1,K,3,I) = WA(I,2,1)*DR3+WA(I,2,2)*DI3
  80   104    CONTINUE
  81   105 CONTINUE
  82       RETURN
  83       END