share/fftpack5/fortran/c1f2kf.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 C1F2KF (IDO,L1,NA,CC,IN1,CH,IN2,WA)
  12       REAL  CC(IN1,L1,IDO,2),CH(IN2,L1,2,IDO),WA(IDO,1,2)
  13 C
  14       IF (IDO .GT. 1) GO TO 102
  15       SN = 1./REAL(2*L1)
  16       IF (NA .EQ. 1) GO TO 106
  17       DO 101 K=1,L1
  18          CHOLD1 = SN*(CC(1,K,1,1)+CC(1,K,1,2))
  19          CC(1,K,1,2) = SN*(CC(1,K,1,1)-CC(1,K,1,2))
  20          CC(1,K,1,1) = CHOLD1
  21          CHOLD2 = SN*(CC(2,K,1,1)+CC(2,K,1,2))
  22          CC(2,K,1,2) = SN*(CC(2,K,1,1)-CC(2,K,1,2))
  23          CC(2,K,1,1) = CHOLD2
  24   101 CONTINUE
  25       RETURN
  26   106 DO 107 K=1,L1
  27          CH(1,K,1,1) = SN*(CC(1,K,1,1)+CC(1,K,1,2))
  28          CH(1,K,2,1) = SN*(CC(1,K,1,1)-CC(1,K,1,2))
  29          CH(2,K,1,1) = SN*(CC(2,K,1,1)+CC(2,K,1,2))
  30          CH(2,K,2,1) = SN*(CC(2,K,1,1)-CC(2,K,1,2))
  31   107 CONTINUE
  32       RETURN
  33   102 DO 103 K=1,L1
  34          CH(1,K,1,1) = CC(1,K,1,1)+CC(1,K,1,2)
  35          CH(1,K,2,1) = CC(1,K,1,1)-CC(1,K,1,2)
  36          CH(2,K,1,1) = CC(2,K,1,1)+CC(2,K,1,2)
  37          CH(2,K,2,1) = CC(2,K,1,1)-CC(2,K,1,2)
  38   103 CONTINUE
  39       DO 105 I=2,IDO
  40          DO 104 K=1,L1
  41             CH(1,K,1,I) = CC(1,K,I,1)+CC(1,K,I,2)
  42             TR2 = CC(1,K,I,1)-CC(1,K,I,2)
  43             CH(2,K,1,I) = CC(2,K,I,1)+CC(2,K,I,2)
  44             TI2 = CC(2,K,I,1)-CC(2,K,I,2)
  45             CH(2,K,2,I) = WA(I,1,1)*TI2-WA(I,1,2)*TR2
  46             CH(1,K,2,I) = WA(I,1,1)*TR2+WA(I,1,2)*TI2
  47   104    CONTINUE
  48   105 CONTINUE
  49       RETURN
  50       END