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!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
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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: mradf3_8.ftn,v 1.2 2010/08/20 16:39:42 armaanl Exp $
C
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
SUBROUTINE MRADF3_8 (M,IDO,L1,CC,IM1,IN1,CH,IM2,IN2,WA1,WA2) 2
#include "taglam4d.cdk"
REAL*8 CH(IN2,IDO,3,L1) ,CC(IN1,IDO,L1,3) ,
1 WA1(IDO) ,WA2(IDO)
real*8 ARG,TAUR,TAUI
C
M1D = (M-1)*IM1+1
M2S = 1-IM2
ARG=2.d0*4.d0*DATAN(1.d0)/3.d0
! ARG=2.*4.*ATAN(1.0)/3.
TAUR=DCOS(ARG)
TAUI=DSIN(ARG)
DO 101 K=1,L1
M2 = M2S
DO 1001 M1=1,M1D,IM1
M2 = M2+IM2
CH(M2,1,1,K) = CC(M1,1,K,1)+(CC(M1,1,K,2)+CC(M1,1,K,3))
CH(M2,1,3,K) = TAUI*(CC(M1,1,K,3)-CC(M1,1,K,2))
CH(M2,IDO,2,K) = CC(M1,1,K,1)+TAUR*
1 (CC(M1,1,K,2)+CC(M1,1,K,3))
1001 CONTINUE
101 CONTINUE
IF (IDO .EQ. 1) RETURN
IDP2 = IDO+2
DO 103 K=1,L1
DO 102 I=3,IDO,2
IC = IDP2-I
M2 = M2S
DO 1002 M1=1,M1D,IM1
M2 = M2+IM2
CH(M2,I-1,1,K) = CC(M1,I-1,K,1)+((WA1(I-2)*CC(M1,I-1,K,2)+
1 WA1(I-1)*CC(M1,I,K,2))+(WA2(I-2)*CC(M1,I-1,K,3)+WA2(I-1)*
1 CC(M1,I,K,3)))
CH(M2,I,1,K) = CC(M1,I,K,1)+((WA1(I-2)*CC(M1,I,K,2)-
1 WA1(I-1)*CC(M1,I-1,K,2))+(WA2(I-2)*CC(M1,I,K,3)-WA2(I-1)*
1 CC(M1,I-1,K,3)))
CH(M2,I-1,3,K) = (CC(M1,I-1,K,1)+TAUR*((WA1(I-2)*
1 CC(M1,I-1,K,2)+WA1(I-1)*CC(M1,I,K,2))+(WA2(I-2)*
1 CC(M1,I-1,K,3)+WA2(I-1)*CC(M1,I,K,3))))+(TAUI*((WA1(I-2)*
1 CC(M1,I,K,2)-WA1(I-1)*CC(M1,I-1,K,2))-(WA2(I-2)*
1 CC(M1,I,K,3)-WA2(I-1)*CC(M1,I-1,K,3))))
CH(M2,IC-1,2,K) = (CC(M1,I-1,K,1)+TAUR*((WA1(I-2)*
1 CC(M1,I-1,K,2)+WA1(I-1)*CC(M1,I,K,2))+(WA2(I-2)*
1 CC(M1,I-1,K,3)+WA2(I-1)*CC(M1,I,K,3))))-(TAUI*((WA1(I-2)*
1 CC(M1,I,K,2)-WA1(I-1)*CC(M1,I-1,K,2))-(WA2(I-2)*
1 CC(M1,I,K,3)-WA2(I-1)*CC(M1,I-1,K,3))))
CH(M2,I,3,K) = (CC(M1,I,K,1)+TAUR*((WA1(I-2)*CC(M1,I,K,2)-
1 WA1(I-1)*CC(M1,I-1,K,2))+(WA2(I-2)*CC(M1,I,K,3)-WA2(I-1)*
1 CC(M1,I-1,K,3))))+(TAUI*((WA2(I-2)*CC(M1,I-1,K,3)+WA2(I-1)*
1 CC(M1,I,K,3))-(WA1(I-2)*CC(M1,I-1,K,2)+WA1(I-1)*
1 CC(M1,I,K,2))))
CH(M2,IC,2,K) = (TAUI*((WA2(I-2)*CC(M1,I-1,K,3)+WA2(I-1)*
1 CC(M1,I,K,3))-(WA1(I-2)*CC(M1,I-1,K,2)+WA1(I-1)*
1 CC(M1,I,K,2))))-(CC(M1,I,K,1)+TAUR*((WA1(I-2)*CC(M1,I,K,2)-
1 WA1(I-1)*CC(M1,I-1,K,2))+(WA2(I-2)*CC(M1,I,K,3)-WA2(I-1)*
1 CC(M1,I-1,K,3))))
1002 CONTINUE
102 CONTINUE
103 CONTINUE
RETURN
END