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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: mradb3_8.ftn,v 1.4 2011/11/29 15:45:00 armaanl Exp $
C
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
SUBROUTINE MRADB3_8 (M,IDO,L1,CC,IM1,IN1,CH,IM2,IN2,WA1,WA2) 2
#include "taglam4d.cdk"
REAL*8 CC(IN1,IDO,3,L1) ,CH(IN2,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
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,K,1) = CC(M1,1,1,K)+2.*CC(M1,IDO,2,K)
CH(M2,1,K,2) = CC(M1,1,1,K)+(2.*TAUR)*CC(M1,IDO,2,K)
1 -(2.*TAUI)*CC(M1,1,3,K)
CH(M2,1,K,3) = CC(M1,1,1,K)+(2.*TAUR)*CC(M1,IDO,2,K)
1 +2.*TAUI*CC(M1,1,3,K)
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,K,1) = CC(M1,I-1,1,K)+(CC(M1,I-1,3,K)+CC(M1,IC-1,2,K))
CH(M2,I,K,1) = CC(M1,I,1,K)+(CC(M1,I,3,K)-CC(M1,IC,2,K))
CH(M2,I-1,K,2) = WA1(I-2)*
1 ((CC(M1,I-1,1,K)+TAUR*(CC(M1,I-1,3,K)+CC(M1,IC-1,2,K)))-
* (TAUI*(CC(M1,I,3,K)+CC(M1,IC,2,K))))
2 -WA1(I-1)*
3 ((CC(M1,I,1,K)+TAUR*(CC(M1,I,3,K)-CC(M1,IC,2,K)))+
* (TAUI*(CC(M1,I-1,3,K)-CC(M1,IC-1,2,K))))
CH(M2,I,K,2) = WA1(I-2)*
4 ((CC(M1,I,1,K)+TAUR*(CC(M1,I,3,K)-CC(M1,IC,2,K)))+
8 (TAUI*(CC(M1,I-1,3,K)-CC(M1,IC-1,2,K))))
5 +WA1(I-1)*
6 ((CC(M1,I-1,1,K)+TAUR*(CC(M1,I-1,3,K)+CC(M1,IC-1,2,K)))-
8 (TAUI*(CC(M1,I,3,K)+CC(M1,IC,2,K))))
CH(M2,I-1,K,3) = WA2(I-2)*
7 ((CC(M1,I-1,1,K)+TAUR*(CC(M1,I-1,3,K)+CC(M1,IC-1,2,K)))+
8 (TAUI*(CC(M1,I,3,K)+CC(M1,IC,2,K))))
8 -WA2(I-1)*
9 ((CC(M1,I,1,K)+TAUR*(CC(M1,I,3,K)-CC(M1,IC,2,K)))-
8 (TAUI*(CC(M1,I-1,3,K)-CC(M1,IC-1,2,K))))
CH(M2,I,K,3) = WA2(I-2)*
1 ((CC(M1,I,1,K)+TAUR*(CC(M1,I,3,K)-CC(M1,IC,2,K)))-
8 (TAUI*(CC(M1,I-1,3,K)-CC(M1,IC-1,2,K))))
2 +WA2(I-1)*
3 ((CC(M1,I-1,1,K)+TAUR*(CC(M1,I-1,3,K)+CC(M1,IC-1,2,K)))+
8 (TAUI*(CC(M1,I,3,K)+CC(M1,IC,2,K))))
1002 CONTINUE
102 CONTINUE
103 CONTINUE
RETURN
END