share/fftpack5/fortran/c1f2kb.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 C1F2KB (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 .OR. NA.EQ.1) GO TO 102
  15       DO 101 K=1,L1
  16          CHOLD1 = CC(1,K,1,1)+CC(1,K,1,2)
  17          CC(1,K,1,2) = CC(1,K,1,1)-CC(1,K,1,2)
  18          CC(1,K,1,1) = CHOLD1
  19          CHOLD2 = CC(2,K,1,1)+CC(2,K,1,2)
  20          CC(2,K,1,2) = CC(2,K,1,1)-CC(2,K,1,2)
  21          CC(2,K,1,1) = CHOLD2
  22   101 CONTINUE
  23       RETURN
  24   102 DO 103 K=1,L1
  25          CH(1,K,1,1) = CC(1,K,1,1)+CC(1,K,1,2)
  26          CH(1,K,2,1) = CC(1,K,1,1)-CC(1,K,1,2)
  27          CH(2,K,1,1) = CC(2,K,1,1)+CC(2,K,1,2)
  28          CH(2,K,2,1) = CC(2,K,1,1)-CC(2,K,1,2)
  29   103 CONTINUE
  30       IF(IDO .EQ. 1) RETURN
  31       DO 105 I=2,IDO
  32          DO 104 K=1,L1
  33             CH(1,K,1,I) = CC(1,K,I,1)+CC(1,K,I,2)
  34             TR2 = CC(1,K,I,1)-CC(1,K,I,2)
  35             CH(2,K,1,I) = CC(2,K,I,1)+CC(2,K,I,2)
  36             TI2 = CC(2,K,I,1)-CC(2,K,I,2)
  37             CH(2,K,2,I) = WA(I,1,1)*TI2+WA(I,1,2)*TR2
  38             CH(1,K,2,I) = WA(I,1,1)*TR2-WA(I,1,2)*TI2
  39   104    CONTINUE
  40   105 CONTINUE
  41       RETURN
  42       END