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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: cmf2kf_8.ftn,v 1.4 2011/11/29 15:44:44 armaanl Exp $
C
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SUBROUTINE CMF2KF_8 (LOT,IDO,L1,NA,CC,IM1,IN1,CH,IM2,IN2,WA) 2
IMPLICIT NONE
#include "taglam4d.cdk"
integer m2s,m1d,in2,k,i,m2,m1,l1,ido,lot,na,im2,in1,im1
REAL*8 CC(2,IN1,L1,IDO,2),CH(2,IN2,L1,2,IDO),WA(IDO,1,2)
real*8 SN,CHOLD1,CHOLD2
real*8 TR2,TI2
C
M1D = (LOT-1)*IM1+1
M2S = 1-IM2
IF (IDO .GT. 1) GO TO 102
SN = 1.d0/REAL(2*L1)
IF (NA .EQ. 1) GO TO 106
DO 101 K=1,L1
DO 101 M1=1,M1D,IM1
CHOLD1 = SN*(CC(1,M1,K,1,1)+CC(1,M1,K,1,2))
CC(1,M1,K,1,2) = SN*(CC(1,M1,K,1,1)-CC(1,M1,K,1,2))
CC(1,M1,K,1,1) = CHOLD1
CHOLD2 = SN*(CC(2,M1,K,1,1)+CC(2,M1,K,1,2))
CC(2,M1,K,1,2) = SN*(CC(2,M1,K,1,1)-CC(2,M1,K,1,2))
CC(2,M1,K,1,1) = CHOLD2
101 CONTINUE
RETURN
106 DO 107 K=1,L1
M2 = M2S
DO 107 M1=1,M1D,IM1
M2 = M2+IM2
CH(1,M2,K,1,1) = SN*(CC(1,M1,K,1,1)+CC(1,M1,K,1,2))
CH(1,M2,K,2,1) = SN*(CC(1,M1,K,1,1)-CC(1,M1,K,1,2))
CH(2,M2,K,1,1) = SN*(CC(2,M1,K,1,1)+CC(2,M1,K,1,2))
CH(2,M2,K,2,1) = SN*(CC(2,M1,K,1,1)-CC(2,M1,K,1,2))
107 CONTINUE
RETURN
102 DO 103 K=1,L1
M2 = M2S
DO 103 M1=1,M1D,IM1
M2 = M2+IM2
CH(1,M2,K,1,1) = CC(1,M1,K,1,1)+CC(1,M1,K,1,2)
CH(1,M2,K,2,1) = CC(1,M1,K,1,1)-CC(1,M1,K,1,2)
CH(2,M2,K,1,1) = CC(2,M1,K,1,1)+CC(2,M1,K,1,2)
CH(2,M2,K,2,1) = CC(2,M1,K,1,1)-CC(2,M1,K,1,2)
103 CONTINUE
DO 105 I=2,IDO
DO 104 K=1,L1
M2 = M2S
DO 104 M1=1,M1D,IM1
M2 = M2+IM2
CH(1,M2,K,1,I) = CC(1,M1,K,I,1)+CC(1,M1,K,I,2)
TR2 = CC(1,M1,K,I,1)-CC(1,M1,K,I,2)
CH(2,M2,K,1,I) = CC(2,M1,K,I,1)+CC(2,M1,K,I,2)
TI2 = CC(2,M1,K,I,1)-CC(2,M1,K,I,2)
CH(2,M2,K,2,I) = WA(I,1,1)*TI2-WA(I,1,2)*TR2
CH(1,M2,K,2,I) = WA(I,1,1)*TR2+WA(I,1,2)*TI2
104 CONTINUE
105 CONTINUE
RETURN
END