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!Environment Canada - Atmospheric Science and Technology License/Disclaimer,
! version 3; Last Modified: May 7, 2008.
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C
C FFTPACK 5.0
C Copyright (C) 1995-2004, Scientific Computing Division,
C University Corporation for Atmospheric Research
C Licensed under the GNU General Public License (GPL)
C
C Authors: Paul N. Swarztrauber and Richard A. Valent
C
C $Id: cmf3kf_8.ftn,v 1.4 2011/11/29 15:44:44 armaanl Exp $
C
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SUBROUTINE CMF3KF_8 (LOT,IDO,L1,NA,CC,IM1,IN1,CH,IM2,IN2,WA) 2
#include "taglam4d.cdk"
REAL*8 CC(2,IN1,L1,IDO,3),CH(2,IN2,L1,3,IDO),WA(IDO,2,2)
real*8 TAUR,TAUI,SN,TR2,CR2,TI2,CI2,CR3,CI3
real*8 DR2,DR3,DI2,DI3
DATA TAUR,TAUI /-.5,-.866025403784439/
C
M1D = (LOT-1)*IM1+1
M2S = 1-IM2
IF (IDO .GT. 1) GO TO 102
SN = 1.d0/REAL(3*L1)
IF (NA .EQ. 1) GO TO 106
DO 101 K=1,L1
DO 101 M1=1,M1D,IM1
TR2 = CC(1,M1,K,1,2)+CC(1,M1,K,1,3)
CR2 = CC(1,M1,K,1,1)+TAUR*TR2
CC(1,M1,K,1,1) = SN*(CC(1,M1,K,1,1)+TR2)
TI2 = CC(2,M1,K,1,2)+CC(2,M1,K,1,3)
CI2 = CC(2,M1,K,1,1)+TAUR*TI2
CC(2,M1,K,1,1) = SN*(CC(2,M1,K,1,1)+TI2)
CR3 = TAUI*(CC(1,M1,K,1,2)-CC(1,M1,K,1,3))
CI3 = TAUI*(CC(2,M1,K,1,2)-CC(2,M1,K,1,3))
CC(1,M1,K,1,2) = SN*(CR2-CI3)
CC(1,M1,K,1,3) = SN*(CR2+CI3)
CC(2,M1,K,1,2) = SN*(CI2+CR3)
CC(2,M1,K,1,3) = SN*(CI2-CR3)
101 CONTINUE
RETURN
106 DO 107 K=1,L1
M2 = M2S
DO 107 M1=1,M1D,IM1
M2 = M2+IM2
TR2 = CC(1,M1,K,1,2)+CC(1,M1,K,1,3)
CR2 = CC(1,M1,K,1,1)+TAUR*TR2
CH(1,M2,K,1,1) = SN*(CC(1,M1,K,1,1)+TR2)
TI2 = CC(2,M1,K,1,2)+CC(2,M1,K,1,3)
CI2 = CC(2,M1,K,1,1)+TAUR*TI2
CH(2,M2,K,1,1) = SN*(CC(2,M1,K,1,1)+TI2)
CR3 = TAUI*(CC(1,M1,K,1,2)-CC(1,M1,K,1,3))
CI3 = TAUI*(CC(2,M1,K,1,2)-CC(2,M1,K,1,3))
CH(1,M2,K,2,1) = SN*(CR2-CI3)
CH(1,M2,K,3,1) = SN*(CR2+CI3)
CH(2,M2,K,2,1) = SN*(CI2+CR3)
CH(2,M2,K,3,1) = SN*(CI2-CR3)
107 CONTINUE
RETURN
102 DO 103 K=1,L1
M2 = M2S
DO 103 M1=1,M1D,IM1
M2 = M2+IM2
TR2 = CC(1,M1,K,1,2)+CC(1,M1,K,1,3)
CR2 = CC(1,M1,K,1,1)+TAUR*TR2
CH(1,M2,K,1,1) = CC(1,M1,K,1,1)+TR2
TI2 = CC(2,M1,K,1,2)+CC(2,M1,K,1,3)
CI2 = CC(2,M1,K,1,1)+TAUR*TI2
CH(2,M2,K,1,1) = CC(2,M1,K,1,1)+TI2
CR3 = TAUI*(CC(1,M1,K,1,2)-CC(1,M1,K,1,3))
CI3 = TAUI*(CC(2,M1,K,1,2)-CC(2,M1,K,1,3))
CH(1,M2,K,2,1) = CR2-CI3
CH(1,M2,K,3,1) = CR2+CI3
CH(2,M2,K,2,1) = CI2+CR3
CH(2,M2,K,3,1) = CI2-CR3
103 CONTINUE
DO 105 I=2,IDO
DO 104 K=1,L1
M2 = M2S
DO 104 M1=1,M1D,IM1
M2 = M2+IM2
TR2 = CC(1,M1,K,I,2)+CC(1,M1,K,I,3)
CR2 = CC(1,M1,K,I,1)+TAUR*TR2
CH(1,M2,K,1,I) = CC(1,M1,K,I,1)+TR2
TI2 = CC(2,M1,K,I,2)+CC(2,M1,K,I,3)
CI2 = CC(2,M1,K,I,1)+TAUR*TI2
CH(2,M2,K,1,I) = CC(2,M1,K,I,1)+TI2
CR3 = TAUI*(CC(1,M1,K,I,2)-CC(1,M1,K,I,3))
CI3 = TAUI*(CC(2,M1,K,I,2)-CC(2,M1,K,I,3))
DR2 = CR2-CI3
DR3 = CR2+CI3
DI2 = CI2+CR3
DI3 = CI2-CR3
CH(2,M2,K,2,I) = WA(I,1,1)*DI2-WA(I,1,2)*DR2
CH(1,M2,K,2,I) = WA(I,1,1)*DR2+WA(I,1,2)*DI2
CH(2,M2,K,3,I) = WA(I,2,1)*DI3-WA(I,2,2)*DR3
CH(1,M2,K,3,I) = WA(I,2,1)*DR3+WA(I,2,2)*DI3
104 CONTINUE
105 CONTINUE
RETURN
END