wrfv2_fire/external/fftpack/fftpack5/cmf3kf.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: cmf3kf.f,v 1.2 2004/06/15 21:08:32 rodney Exp $
  11 !
  12 !CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
  13
  14       SUBROUTINE CMF3KF (LOT,IDO,L1,NA,CC,IM1,IN1,CH,IM2,IN2,WA)
  15       REAL  CC(2,IN1,L1,IDO,3),CH(2,IN2,L1,3,IDO),WA(IDO,2,2)
  16       DATA TAUR,TAUI /-.5,-.866025403784439/
  17 !
  18       M1D = (LOT-1)*IM1+1
  19       M2S = 1-IM2
  20       IF (IDO .GT. 1) GO TO 102
  21       SN = 1./REAL(3*L1)
  22       IF (NA .EQ. 1) GO TO 106
  23       DO 101 K=1,L1
  24          DO 101 M1=1,M1D,IM1
  25          TR2 = CC(1,M1,K,1,2)+CC(1,M1,K,1,3)
  26          CR2 = CC(1,M1,K,1,1)+TAUR*TR2
  27          CC(1,M1,K,1,1) = SN*(CC(1,M1,K,1,1)+TR2)
  28          TI2 = CC(2,M1,K,1,2)+CC(2,M1,K,1,3)
  29          CI2 = CC(2,M1,K,1,1)+TAUR*TI2
  30          CC(2,M1,K,1,1) = SN*(CC(2,M1,K,1,1)+TI2)
  31          CR3 = TAUI*(CC(1,M1,K,1,2)-CC(1,M1,K,1,3))
  32          CI3 = TAUI*(CC(2,M1,K,1,2)-CC(2,M1,K,1,3))
  33          CC(1,M1,K,1,2) = SN*(CR2-CI3)
  34          CC(1,M1,K,1,3) = SN*(CR2+CI3)
  35          CC(2,M1,K,1,2) = SN*(CI2+CR3)
  36          CC(2,M1,K,1,3) = SN*(CI2-CR3)
  37   101 CONTINUE
  38       RETURN
  39   106 DO 107 K=1,L1
  40          M2 = M2S
  41          DO 107 M1=1,M1D,IM1
  42          M2 = M2+IM2
  43          TR2 = CC(1,M1,K,1,2)+CC(1,M1,K,1,3)
  44          CR2 = CC(1,M1,K,1,1)+TAUR*TR2
  45          CH(1,M2,K,1,1) = SN*(CC(1,M1,K,1,1)+TR2)
  46          TI2 = CC(2,M1,K,1,2)+CC(2,M1,K,1,3)
  47          CI2 = CC(2,M1,K,1,1)+TAUR*TI2
  48          CH(2,M2,K,1,1) = SN*(CC(2,M1,K,1,1)+TI2)
  49          CR3 = TAUI*(CC(1,M1,K,1,2)-CC(1,M1,K,1,3))
  50          CI3 = TAUI*(CC(2,M1,K,1,2)-CC(2,M1,K,1,3))
  51          CH(1,M2,K,2,1) = SN*(CR2-CI3)
  52          CH(1,M2,K,3,1) = SN*(CR2+CI3)
  53          CH(2,M2,K,2,1) = SN*(CI2+CR3)
  54          CH(2,M2,K,3,1) = SN*(CI2-CR3)
  55   107 CONTINUE
  56       RETURN
  57   102 DO 103 K=1,L1
  58          M2 = M2S
  59          DO 103 M1=1,M1D,IM1
  60          M2 = M2+IM2
  61          TR2 = CC(1,M1,K,1,2)+CC(1,M1,K,1,3)
  62          CR2 = CC(1,M1,K,1,1)+TAUR*TR2
  63          CH(1,M2,K,1,1) = CC(1,M1,K,1,1)+TR2
  64          TI2 = CC(2,M1,K,1,2)+CC(2,M1,K,1,3)
  65          CI2 = CC(2,M1,K,1,1)+TAUR*TI2
  66          CH(2,M2,K,1,1) = CC(2,M1,K,1,1)+TI2
  67          CR3 = TAUI*(CC(1,M1,K,1,2)-CC(1,M1,K,1,3))
  68          CI3 = TAUI*(CC(2,M1,K,1,2)-CC(2,M1,K,1,3))
  69          CH(1,M2,K,2,1) = CR2-CI3
  70          CH(1,M2,K,3,1) = CR2+CI3
  71          CH(2,M2,K,2,1) = CI2+CR3
  72          CH(2,M2,K,3,1) = CI2-CR3
  73   103 CONTINUE
  74       DO 105 I=2,IDO
  75         DO 104 K=1,L1
  76          M2 = M2S
  77          DO 104 M1=1,M1D,IM1
  78          M2 = M2+IM2
  79             TR2 = CC(1,M1,K,I,2)+CC(1,M1,K,I,3)
  80             CR2 = CC(1,M1,K,I,1)+TAUR*TR2
  81             CH(1,M2,K,1,I) = CC(1,M1,K,I,1)+TR2
  82             TI2 = CC(2,M1,K,I,2)+CC(2,M1,K,I,3)
  83             CI2 = CC(2,M1,K,I,1)+TAUR*TI2
  84             CH(2,M2,K,1,I) = CC(2,M1,K,I,1)+TI2
  85             CR3 = TAUI*(CC(1,M1,K,I,2)-CC(1,M1,K,I,3))
  86             CI3 = TAUI*(CC(2,M1,K,I,2)-CC(2,M1,K,I,3))
  87             DR2 = CR2-CI3
  88             DR3 = CR2+CI3
  89             DI2 = CI2+CR3
  90             DI3 = CI2-CR3
  91             CH(2,M2,K,2,I) = WA(I,1,1)*DI2-WA(I,1,2)*DR2
  92             CH(1,M2,K,2,I) = WA(I,1,1)*DR2+WA(I,1,2)*DI2
  93             CH(2,M2,K,3,I) = WA(I,2,1)*DI3-WA(I,2,2)*DR3
  94             CH(1,M2,K,3,I) = WA(I,2,1)*DR3+WA(I,2,2)*DI3
  95   104    CONTINUE
  96   105 END DO
  97       RETURN
  98       END