!-------------------------------------- LICENCE BEGIN ------------------------------------
!Environment Canada - Atmospheric Science and Technology License/Disclaimer,
! version 3; Last Modified: May 7, 2008.
!This is free but copyrighted software; you can use/redistribute/modify it under the terms
!of the Environment Canada - Atmospheric Science and Technology License/Disclaimer
!version 3 or (at your option) any later version that should be found at:
!http://collaboration.cmc.ec.gc.ca/science/rpn.comm/license.html
!
!This software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
!without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
!See the above mentioned License/Disclaimer for more details.
!You should have received a copy of the License/Disclaimer along with this software;
!if not, you can write to: EC-RPN COMM Group, 2121 TransCanada, suite 500, Dorval (Quebec),
!CANADA, H9P 1J3; or send e-mail to service.rpn@ec.gc.ca
!-------------------------------------- LICENCE END --------------------------------------
!
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
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: cmf4kf_8.ftn,v 1.4 2011/11/29 15:44:44 armaanl Exp $
C
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
SUBROUTINE CMF4KF_8 (LOT,IDO,L1,NA,CC,IM1,IN1,CH,IM2,IN2,WA) 2
#include "taglam4d.cdk"
REAL*8 CC(2,IN1,L1,IDO,4),CH(2,IN2,L1,4,IDO),WA(IDO,3,2)
real*8 SN,TI1,TI2,TR4,TI3,TR1,TR2,TI4,TR3
real*8 CR3,CI3,CR2,CR4,CI2,CI4
C
C FFTPACK 5.0 auxiliary routine
C
M1D = (LOT-1)*IM1+1
M2S = 1-IM2
IF (IDO .GT. 1) GO TO 102
SN = 1.d0/REAL(4*L1)
IF (NA .EQ. 1) GO TO 106
DO 101 K=1,L1
DO 101 M1=1,M1D,IM1
TI1 = CC(2,M1,K,1,1)-CC(2,M1,K,1,3)
TI2 = CC(2,M1,K,1,1)+CC(2,M1,K,1,3)
TR4 = CC(2,M1,K,1,2)-CC(2,M1,K,1,4)
TI3 = CC(2,M1,K,1,2)+CC(2,M1,K,1,4)
TR1 = CC(1,M1,K,1,1)-CC(1,M1,K,1,3)
TR2 = CC(1,M1,K,1,1)+CC(1,M1,K,1,3)
TI4 = CC(1,M1,K,1,4)-CC(1,M1,K,1,2)
TR3 = CC(1,M1,K,1,2)+CC(1,M1,K,1,4)
CC(1,M1,K,1,1) = SN*(TR2+TR3)
CC(1,M1,K,1,3) = SN*(TR2-TR3)
CC(2,M1,K,1,1) = SN*(TI2+TI3)
CC(2,M1,K,1,3) = SN*(TI2-TI3)
CC(1,M1,K,1,2) = SN*(TR1+TR4)
CC(1,M1,K,1,4) = SN*(TR1-TR4)
CC(2,M1,K,1,2) = SN*(TI1+TI4)
CC(2,M1,K,1,4) = SN*(TI1-TI4)
101 CONTINUE
RETURN
106 DO 107 K=1,L1
M2 = M2S
DO 107 M1=1,M1D,IM1
M2 = M2+IM2
TI1 = CC(2,M1,K,1,1)-CC(2,M1,K,1,3)
TI2 = CC(2,M1,K,1,1)+CC(2,M1,K,1,3)
TR4 = CC(2,M1,K,1,2)-CC(2,M1,K,1,4)
TI3 = CC(2,M1,K,1,2)+CC(2,M1,K,1,4)
TR1 = CC(1,M1,K,1,1)-CC(1,M1,K,1,3)
TR2 = CC(1,M1,K,1,1)+CC(1,M1,K,1,3)
TI4 = CC(1,M1,K,1,4)-CC(1,M1,K,1,2)
TR3 = CC(1,M1,K,1,2)+CC(1,M1,K,1,4)
CH(1,M2,K,1,1) = SN*(TR2+TR3)
CH(1,M2,K,3,1) = SN*(TR2-TR3)
CH(2,M2,K,1,1) = SN*(TI2+TI3)
CH(2,M2,K,3,1) = SN*(TI2-TI3)
CH(1,M2,K,2,1) = SN*(TR1+TR4)
CH(1,M2,K,4,1) = SN*(TR1-TR4)
CH(2,M2,K,2,1) = SN*(TI1+TI4)
CH(2,M2,K,4,1) = SN*(TI1-TI4)
107 CONTINUE
RETURN
102 DO 103 K=1,L1
M2 = M2S
DO 103 M1=1,M1D,IM1
M2 = M2+IM2
TI1 = CC(2,M1,K,1,1)-CC(2,M1,K,1,3)
TI2 = CC(2,M1,K,1,1)+CC(2,M1,K,1,3)
TR4 = CC(2,M1,K,1,2)-CC(2,M1,K,1,4)
TI3 = CC(2,M1,K,1,2)+CC(2,M1,K,1,4)
TR1 = CC(1,M1,K,1,1)-CC(1,M1,K,1,3)
TR2 = CC(1,M1,K,1,1)+CC(1,M1,K,1,3)
TI4 = CC(1,M1,K,1,4)-CC(1,M1,K,1,2)
TR3 = CC(1,M1,K,1,2)+CC(1,M1,K,1,4)
CH(1,M2,K,1,1) = TR2+TR3
CH(1,M2,K,3,1) = TR2-TR3
CH(2,M2,K,1,1) = TI2+TI3
CH(2,M2,K,3,1) = TI2-TI3
CH(1,M2,K,2,1) = TR1+TR4
CH(1,M2,K,4,1) = TR1-TR4
CH(2,M2,K,2,1) = TI1+TI4
CH(2,M2,K,4,1) = TI1-TI4
103 CONTINUE
DO 105 I=2,IDO
DO 104 K=1,L1
M2 = M2S
DO 104 M1=1,M1D,IM1
M2 = M2+IM2
TI1 = CC(2,M1,K,I,1)-CC(2,M1,K,I,3)
TI2 = CC(2,M1,K,I,1)+CC(2,M1,K,I,3)
TI3 = CC(2,M1,K,I,2)+CC(2,M1,K,I,4)
TR4 = CC(2,M1,K,I,2)-CC(2,M1,K,I,4)
TR1 = CC(1,M1,K,I,1)-CC(1,M1,K,I,3)
TR2 = CC(1,M1,K,I,1)+CC(1,M1,K,I,3)
TI4 = CC(1,M1,K,I,4)-CC(1,M1,K,I,2)
TR3 = CC(1,M1,K,I,2)+CC(1,M1,K,I,4)
CH(1,M2,K,1,I) = TR2+TR3
CR3 = TR2-TR3
CH(2,M2,K,1,I) = TI2+TI3
CI3 = TI2-TI3
CR2 = TR1+TR4
CR4 = TR1-TR4
CI2 = TI1+TI4
CI4 = TI1-TI4
CH(1,M2,K,2,I) = WA(I,1,1)*CR2+WA(I,1,2)*CI2
CH(2,M2,K,2,I) = WA(I,1,1)*CI2-WA(I,1,2)*CR2
CH(1,M2,K,3,I) = WA(I,2,1)*CR3+WA(I,2,2)*CI3
CH(2,M2,K,3,I) = WA(I,2,1)*CI3-WA(I,2,2)*CR3
CH(1,M2,K,4,I) = WA(I,3,1)*CR4+WA(I,3,2)*CI4
CH(2,M2,K,4,I) = WA(I,3,1)*CI4-WA(I,3,2)*CR4
104 CONTINUE
105 CONTINUE
RETURN
END