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*DECK PIJRDG
SUBROUTINE PIJRDG(IPRT,NREG,NSOUT,SIGTAL,PROB)
*
*-----------------------------------------------------------------------
*
*Purpose:
* Diagonal normalization of collision probs (CP).
*
*Copyright:
* Copyright (C) 1991 Ecole Polytechnique de Montreal
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version
*
*Author(s): R. Roy
*
*Parameters: input
* IPRT print level.
* NREG number of zones for geometry.
* NSOUT number of surfaces for geometry.
* SIGTAL albedo-sigt vector.
*
*Parameters: input/output
* PROB CP matrix for all types.
*
*References:
* R. Roy and G. Marleau,
* Normalization Techniques for CP Matrices,
* CONF/PHYSOR-90, Marseille/France, V 2, P IX-40 (1990).
*-----------------------------------------------------------------------
*
IMPLICIT NONE
INTEGER IPRT,NREG,NSOUT,IR,JR,IPRB,IPRF,IUNK,JUNK,IVOL
REAL SIGTAL(-NSOUT:NREG)
INTEGER IUNOUT,IPRINT
PARAMETER (IUNOUT=6, IPRINT=4)
DOUBLE PRECISION PROB(*),BILAN
IPRB= 0
IUNK= 0
IVOL= NSOUT*(NSOUT+1)/2
*
* RENORMALIZE ALL DIAGONAL ELEMENTS OF MATRIX *PROB*
IF( IPRT.GE.IPRINT )THEN
WRITE(IUNOUT,9000) 'PIJRDG'
ENDIF
DO 100 IR = -NSOUT, NREG
IUNK= IUNK+1
BILAN=0.0
DO 10 JR= -NSOUT, IR-1
IPRB= IPRB+1
IF( JR.LT.0.OR.SIGTAL(JR).GT.0.0 )THEN
BILAN=BILAN + PROB(IPRB)
ENDIF
10 CONTINUE
IPRB= IPRB+1
IPRF= IPRB
JUNK= IUNK
DO 20 JR= IR+1 , NREG
IPRF= IPRF+JUNK
JUNK= JUNK+1
IF( JR.LT.0.OR.SIGTAL(JR).GT.0.0 )THEN
BILAN=BILAN + PROB(IPRF)
ENDIF
20 CONTINUE
IF( IR.LT.0 )THEN
IVOL= IVOL+1
PROB(IPRB)= PROB(IVOL)-BILAN
IF( IPRT.GE.IPRINT )THEN
WRITE(IUNOUT,9001) -IR,BILAN
ENDIF
ELSEIF( IR.GT.0 )THEN
IVOL= IVOL+IUNK-1
IF( SIGTAL(IR).GT.0.0 )THEN
*
* VOIDS ARE NOT BE RENORMALIZED
PROB(IPRB)= PROB(IVOL)-BILAN
IF( IPRT.GE.IPRINT )THEN
WRITE(IUNOUT,9002) IR,BILAN
ENDIF
ENDIF
ELSE
IVOL= IVOL+1
ENDIF
100 CONTINUE
*
9000 FORMAT('Diagonal correction factors for CP in ',A6)
9001 FORMAT('Surface ',I10,5X,E15.6)
9002 FORMAT('Region ',I10,5X,E15.6)
RETURN
END
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