wrfv2_fire/external/fftpack/fftpack5/c1f3kb.F

   1 !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
   2 !
   3 !   FFTPACK 5.0
   4 !   Copyright (C) 1995-2004, Scientific Computing Division,
   5 !   University Corporation for Atmospheric Research
   6 !   Licensed under the GNU General Public License (GPL)
   7 !
   8 !   Authors:  Paul N. Swarztrauber and Richard A. Valent
   9 !
  10 !   $Id: c1f3kb.f,v 1.2 2004/06/15 21:08:32 rodney Exp $
  11 !
  12 !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
  13
  14       SUBROUTINE C1F3KB (IDO,L1,NA,CC,IN1,CH,IN2,WA)
  15       REAL  CC(IN1,L1,IDO,3),CH(IN2,L1,3,IDO),WA(IDO,2,2)
  16       DATA TAUR,TAUI /-.5,.866025403784439/
  17 !
  18       IF (IDO.GT.1 .OR. NA.EQ.1) GO TO 102
  19       DO 101 K=1,L1
  20          TR2 = CC(1,K,1,2)+CC(1,K,1,3)
  21          CR2 = CC(1,K,1,1)+TAUR*TR2
  22          CC(1,K,1,1) = CC(1,K,1,1)+TR2
  23          TI2 = CC(2,K,1,2)+CC(2,K,1,3)
  24          CI2 = CC(2,K,1,1)+TAUR*TI2
  25          CC(2,K,1,1) = CC(2,K,1,1)+TI2
  26          CR3 = TAUI*(CC(1,K,1,2)-CC(1,K,1,3))
  27          CI3 = TAUI*(CC(2,K,1,2)-CC(2,K,1,3))
  28          CC(1,K,1,2) = CR2-CI3
  29          CC(1,K,1,3) = CR2+CI3
  30          CC(2,K,1,2) = CI2+CR3
  31          CC(2,K,1,3) = CI2-CR3
  32   101 END DO
  33       RETURN
  34   102 DO 103 K=1,L1
  35          TR2 = CC(1,K,1,2)+CC(1,K,1,3)
  36          CR2 = CC(1,K,1,1)+TAUR*TR2
  37          CH(1,K,1,1) = CC(1,K,1,1)+TR2
  38          TI2 = CC(2,K,1,2)+CC(2,K,1,3)
  39          CI2 = CC(2,K,1,1)+TAUR*TI2
  40          CH(2,K,1,1) = CC(2,K,1,1)+TI2
  41          CR3 = TAUI*(CC(1,K,1,2)-CC(1,K,1,3))
  42          CI3 = TAUI*(CC(2,K,1,2)-CC(2,K,1,3))
  43          CH(1,K,2,1) = CR2-CI3
  44          CH(1,K,3,1) = CR2+CI3
  45          CH(2,K,2,1) = CI2+CR3
  46          CH(2,K,3,1) = CI2-CR3
  47   103 END DO
  48       IF (IDO .EQ. 1) RETURN
  49       DO 105 I=2,IDO
  50         DO 104 K=1,L1
  51             TR2 = CC(1,K,I,2)+CC(1,K,I,3)
  52             CR2 = CC(1,K,I,1)+TAUR*TR2
  53             CH(1,K,1,I) = CC(1,K,I,1)+TR2
  54             TI2 = CC(2,K,I,2)+CC(2,K,I,3)
  55             CI2 = CC(2,K,I,1)+TAUR*TI2
  56             CH(2,K,1,I) = CC(2,K,I,1)+TI2
  57             CR3 = TAUI*(CC(1,K,I,2)-CC(1,K,I,3))
  58             CI3 = TAUI*(CC(2,K,I,2)-CC(2,K,I,3))
  59             DR2 = CR2-CI3
  60             DR3 = CR2+CI3
  61             DI2 = CI2+CR3
  62             DI3 = CI2-CR3
  63             CH(2,K,2,I) = WA(I,1,1)*DI2+WA(I,1,2)*DR2
  64             CH(1,K,2,I) = WA(I,1,1)*DR2-WA(I,1,2)*DI2
  65             CH(2,K,3,I) = WA(I,2,1)*DI3+WA(I,2,2)*DR3
  66             CH(1,K,3,I) = WA(I,2,1)*DR3-WA(I,2,2)*DI3
  67   104    CONTINUE
  68   105 END DO
  69       RETURN
  70       END