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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: mradb4_8.ftn,v 1.2 2010/08/20 16:39:42 armaanl Exp $
C
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SUBROUTINE MRADB4_8 (M,IDO,L1,CC,IM1,IN1,CH,IM2,IN2,WA1,WA2,WA3) 2
#include "taglam4d.cdk"
REAL*8 CC(IN1,IDO,4,L1) ,CH(IN2,IDO,L1,4) ,
1 WA1(IDO) , WA2(IDO) , WA3(IDO)
real*8 SQRT2
C
M1D = (M-1)*IM1+1
M2S = 1-IM2
SQRT2=DSQRT(2.d0)
DO 101 K=1,L1
M2 = M2S
DO 1001 M1=1,M1D,IM1
M2 = M2+IM2
CH(M2,1,K,3) = (CC(M1,1,1,K)+CC(M1,IDO,4,K))
1 -(CC(M1,IDO,2,K)+CC(M1,IDO,2,K))
CH(M2,1,K,1) = (CC(M1,1,1,K)+CC(M1,IDO,4,K))
1 +(CC(M1,IDO,2,K)+CC(M1,IDO,2,K))
CH(M2,1,K,4) = (CC(M1,1,1,K)-CC(M1,IDO,4,K))
1 +(CC(M1,1,3,K)+CC(M1,1,3,K))
CH(M2,1,K,2) = (CC(M1,1,1,K)-CC(M1,IDO,4,K))
1 -(CC(M1,1,3,K)+CC(M1,1,3,K))
1001 CONTINUE
101 CONTINUE
IF (IDO-2) 107,105,102
102 IDP2 = IDO+2
DO 104 K=1,L1
DO 103 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,IC-1,4,K))
1 +(CC(M1,I-1,3,K)+CC(M1,IC-1,2,K))
CH(M2,I,K,1) = (CC(M1,I,1,K)-CC(M1,IC,4,K))
1 +(CC(M1,I,3,K)-CC(M1,IC,2,K))
CH(M2,I-1,K,2)=WA1(I-2)*((CC(M1,I-1,1,K)-CC(M1,IC-1,4,K))
1 -(CC(M1,I,3,K)+CC(M1,IC,2,K)))-WA1(I-1)
1 *((CC(M1,I,1,K)+CC(M1,IC,4,K))+(CC(M1,I-1,3,K)-CC(M1,IC-1,2,K)))
CH(M2,I,K,2)=WA1(I-2)*((CC(M1,I,1,K)+CC(M1,IC,4,K))
1 +(CC(M1,I-1,3,K)-CC(M1,IC-1,2,K)))+WA1(I-1)
1 *((CC(M1,I-1,1,K)-CC(M1,IC-1,4,K))-(CC(M1,I,3,K)+CC(M1,IC,2,K)))
CH(M2,I-1,K,3)=WA2(I-2)*((CC(M1,I-1,1,K)+CC(M1,IC-1,4,K))
1 -(CC(M1,I-1,3,K)+CC(M1,IC-1,2,K)))-WA2(I-1)
1 *((CC(M1,I,1,K)-CC(M1,IC,4,K))-(CC(M1,I,3,K)-CC(M1,IC,2,K)))
CH(M2,I,K,3)=WA2(I-2)*((CC(M1,I,1,K)-CC(M1,IC,4,K))
1 -(CC(M1,I,3,K)-CC(M1,IC,2,K)))+WA2(I-1)
1 *((CC(M1,I-1,1,K)+CC(M1,IC-1,4,K))-(CC(M1,I-1,3,K)
1 +CC(M1,IC-1,2,K)))
CH(M2,I-1,K,4)=WA3(I-2)*((CC(M1,I-1,1,K)-CC(M1,IC-1,4,K))
1 +(CC(M1,I,3,K)+CC(M1,IC,2,K)))-WA3(I-1)
1 *((CC(M1,I,1,K)+CC(M1,IC,4,K))-(CC(M1,I-1,3,K)-CC(M1,IC-1,2,K)))
CH(M2,I,K,4)=WA3(I-2)*((CC(M1,I,1,K)+CC(M1,IC,4,K))
1 -(CC(M1,I-1,3,K)-CC(M1,IC-1,2,K)))+WA3(I-1)
1 *((CC(M1,I-1,1,K)-CC(M1,IC-1,4,K))+(CC(M1,I,3,K)+CC(M1,IC,2,K)))
1002 CONTINUE
103 CONTINUE
104 CONTINUE
IF (MOD(IDO,2) .EQ. 1) RETURN
105 CONTINUE
DO 106 K=1,L1
M2 = M2S
DO 1003 M1=1,M1D,IM1
M2 = M2+IM2
CH(M2,IDO,K,1) = (CC(M1,IDO,1,K)+CC(M1,IDO,3,K))
1 +(CC(M1,IDO,1,K)+CC(M1,IDO,3,K))
CH(M2,IDO,K,2) = SQRT2*((CC(M1,IDO,1,K)-CC(M1,IDO,3,K))
1 -(CC(M1,1,2,K)+CC(M1,1,4,K)))
CH(M2,IDO,K,3) = (CC(M1,1,4,K)-CC(M1,1,2,K))
1 +(CC(M1,1,4,K)-CC(M1,1,2,K))
CH(M2,IDO,K,4) = -SQRT2*((CC(M1,IDO,1,K)-CC(M1,IDO,3,K))
1 +(CC(M1,1,2,K)+CC(M1,1,4,K)))
1003 CONTINUE
106 CONTINUE
107 RETURN
END