share/fftpack5/fortran/c1f3kb.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 C1F3KB (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 .OR. NA.EQ.1) GO TO 102
  16       DO 101 K=1,L1
  17          TR2 = CC(1,K,1,2)+CC(1,K,1,3)
  18          CR2 = CC(1,K,1,1)+TAUR*TR2
  19          CC(1,K,1,1) = CC(1,K,1,1)+TR2
  20          TI2 = CC(2,K,1,2)+CC(2,K,1,3)
  21          CI2 = CC(2,K,1,1)+TAUR*TI2
  22          CC(2,K,1,1) = CC(2,K,1,1)+TI2
  23          CR3 = TAUI*(CC(1,K,1,2)-CC(1,K,1,3))
  24          CI3 = TAUI*(CC(2,K,1,2)-CC(2,K,1,3))
  25          CC(1,K,1,2) = CR2-CI3
  26          CC(1,K,1,3) = CR2+CI3
  27          CC(2,K,1,2) = CI2+CR3
  28          CC(2,K,1,3) = CI2-CR3
  29   101 CONTINUE
  30       RETURN
  31   102 DO 103 K=1,L1
  32          TR2 = CC(1,K,1,2)+CC(1,K,1,3)
  33          CR2 = CC(1,K,1,1)+TAUR*TR2
  34          CH(1,K,1,1) = CC(1,K,1,1)+TR2
  35          TI2 = CC(2,K,1,2)+CC(2,K,1,3)
  36          CI2 = CC(2,K,1,1)+TAUR*TI2
  37          CH(2,K,1,1) = CC(2,K,1,1)+TI2
  38          CR3 = TAUI*(CC(1,K,1,2)-CC(1,K,1,3))
  39          CI3 = TAUI*(CC(2,K,1,2)-CC(2,K,1,3))
  40          CH(1,K,2,1) = CR2-CI3
  41          CH(1,K,3,1) = CR2+CI3
  42          CH(2,K,2,1) = CI2+CR3
  43          CH(2,K,3,1) = CI2-CR3
  44   103 CONTINUE
  45       IF (IDO .EQ. 1) RETURN
  46       DO 105 I=2,IDO
  47         DO 104 K=1,L1
  48             TR2 = CC(1,K,I,2)+CC(1,K,I,3)
  49             CR2 = CC(1,K,I,1)+TAUR*TR2
  50             CH(1,K,1,I) = CC(1,K,I,1)+TR2
  51             TI2 = CC(2,K,I,2)+CC(2,K,I,3)
  52             CI2 = CC(2,K,I,1)+TAUR*TI2
  53             CH(2,K,1,I) = CC(2,K,I,1)+TI2
  54             CR3 = TAUI*(CC(1,K,I,2)-CC(1,K,I,3))
  55             CI3 = TAUI*(CC(2,K,I,2)-CC(2,K,I,3))
  56             DR2 = CR2-CI3
  57             DR3 = CR2+CI3
  58             DI2 = CI2+CR3
  59             DI3 = CI2-CR3
  60             CH(2,K,2,I) = WA(I,1,1)*DI2+WA(I,1,2)*DR2
  61             CH(1,K,2,I) = WA(I,1,1)*DR2-WA(I,1,2)*DI2
  62             CH(2,K,3,I) = WA(I,2,1)*DI3+WA(I,2,2)*DR3
  63             CH(1,K,3,I) = WA(I,2,1)*DR3-WA(I,2,2)*DI3
  64   104    CONTINUE
  65   105 CONTINUE
  66       RETURN
  67       END