wrfv2_fire/external/fftpack/fftpack5/c1f3kf.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: c1f3kf.f,v 1.2 2004/06/15 21:08:32 rodney Exp $
  11 !
  12 !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
  13
  14       SUBROUTINE C1F3KF (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) GO TO 102
  19       SN = 1./REAL(3*L1)
  20       IF (NA .EQ. 1) GO TO 106
  21       DO 101 K=1,L1
  22          TR2 = CC(1,K,1,2)+CC(1,K,1,3)
  23          CR2 = CC(1,K,1,1)+TAUR*TR2
  24          CC(1,K,1,1) = SN*(CC(1,K,1,1)+TR2)
  25          TI2 = CC(2,K,1,2)+CC(2,K,1,3)
  26          CI2 = CC(2,K,1,1)+TAUR*TI2
  27          CC(2,K,1,1) = SN*(CC(2,K,1,1)+TI2)
  28          CR3 = TAUI*(CC(1,K,1,2)-CC(1,K,1,3))
  29          CI3 = TAUI*(CC(2,K,1,2)-CC(2,K,1,3))
  30          CC(1,K,1,2) = SN*(CR2-CI3)
  31          CC(1,K,1,3) = SN*(CR2+CI3)
  32          CC(2,K,1,2) = SN*(CI2+CR3)
  33          CC(2,K,1,3) = SN*(CI2-CR3)
  34   101 END DO
  35       RETURN
  36   106 DO 107 K=1,L1
  37          TR2 = CC(1,K,1,2)+CC(1,K,1,3)
  38          CR2 = CC(1,K,1,1)+TAUR*TR2
  39          CH(1,K,1,1) = SN*(CC(1,K,1,1)+TR2)
  40          TI2 = CC(2,K,1,2)+CC(2,K,1,3)
  41          CI2 = CC(2,K,1,1)+TAUR*TI2
  42          CH(2,K,1,1) = SN*(CC(2,K,1,1)+TI2)
  43          CR3 = TAUI*(CC(1,K,1,2)-CC(1,K,1,3))
  44          CI3 = TAUI*(CC(2,K,1,2)-CC(2,K,1,3))
  45          CH(1,K,2,1) = SN*(CR2-CI3)
  46          CH(1,K,3,1) = SN*(CR2+CI3)
  47          CH(2,K,2,1) = SN*(CI2+CR3)
  48          CH(2,K,3,1) = SN*(CI2-CR3)
  49   107 END DO
  50       RETURN
  51   102 DO 103 K=1,L1
  52          TR2 = CC(1,K,1,2)+CC(1,K,1,3)
  53          CR2 = CC(1,K,1,1)+TAUR*TR2
  54          CH(1,K,1,1) = CC(1,K,1,1)+TR2
  55          TI2 = CC(2,K,1,2)+CC(2,K,1,3)
  56          CI2 = CC(2,K,1,1)+TAUR*TI2
  57          CH(2,K,1,1) = CC(2,K,1,1)+TI2
  58          CR3 = TAUI*(CC(1,K,1,2)-CC(1,K,1,3))
  59          CI3 = TAUI*(CC(2,K,1,2)-CC(2,K,1,3))
  60          CH(1,K,2,1) = CR2-CI3
  61          CH(1,K,3,1) = CR2+CI3
  62          CH(2,K,2,1) = CI2+CR3
  63          CH(2,K,3,1) = CI2-CR3
  64   103 END DO
  65       DO 105 I=2,IDO
  66         DO 104 K=1,L1
  67             TR2 = CC(1,K,I,2)+CC(1,K,I,3)
  68             CR2 = CC(1,K,I,1)+TAUR*TR2
  69             CH(1,K,1,I) = CC(1,K,I,1)+TR2
  70             TI2 = CC(2,K,I,2)+CC(2,K,I,3)
  71             CI2 = CC(2,K,I,1)+TAUR*TI2
  72             CH(2,K,1,I) = CC(2,K,I,1)+TI2
  73             CR3 = TAUI*(CC(1,K,I,2)-CC(1,K,I,3))
  74             CI3 = TAUI*(CC(2,K,I,2)-CC(2,K,I,3))
  75             DR2 = CR2-CI3
  76             DR3 = CR2+CI3
  77             DI2 = CI2+CR3
  78             DI3 = CI2-CR3
  79             CH(2,K,2,I) = WA(I,1,1)*DI2-WA(I,1,2)*DR2
  80             CH(1,K,2,I) = WA(I,1,1)*DR2+WA(I,1,2)*DI2
  81             CH(2,K,3,I) = WA(I,2,1)*DI3-WA(I,2,2)*DR3
  82             CH(1,K,3,I) = WA(I,2,1)*DR3+WA(I,2,2)*DI3
  83   104    CONTINUE
  84   105 END DO
  85       RETURN
  86       END