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*DECK CHAB02
SUBROUTINE CHAB02(NGRP,IMOD,VALUE,IGM,IGP,VAL,GAR1,DELTA,FMULT)
*
*-----------------------------------------------------------------------
*
*Purpose:
* Modify an array of cross section values.
*
*Copyright:
* Copyright (C) 2007 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): A. Hebert
*
*Parameters: input
* NGRP number of energy groups.
* IMOD type of modification: =1: complete replacement; =2: replace
* specific values by VALUE; =3: increase by VALUE; =4: multiply
* by VALUE.
* VALUE value used in modification operation.
* IGM first energy group to modify.
* IGP last energy group to modify.
* VAL array of values used if IMOD=1.
*
*Parameters: input/output
* GAR1 cross section array to modify on input and
* mofified cross section array at output.
*
*Parameters: output
* DELTA difference in cross section value.
* FMULT modification factors.
*
*-----------------------------------------------------------------------
*
*----
* SUBROUTINE ARGUMENTS
*----
INTEGER NGRP,IMOD,IGM,IGP
REAL VALUE,VAL(NGRP),GAR1(NGRP),DELTA(NGRP),FMULT(NGRP)
*
DELTA(:NGRP)=0.0
FMULT(:NGRP)=1.0
IF(IMOD.EQ.1) THEN
DO 10 IG=IGM,IGP
IF(GAR1(IG).EQ.0.0) THEN
FMULT(IG)=1.0
ELSE
FMULT(IG)=VAL(IG)/GAR1(IG)
ENDIF
DELTA(IG)=VAL(IG)-GAR1(IG)
GAR1(IG)=VAL(IG)
10 CONTINUE
ELSE IF(IMOD.EQ.2) THEN
DO 20 IG=IGM,IGP
IF(GAR1(IG).EQ.0.0) THEN
FMULT(IG)=1.0
ELSE
FMULT(IG)=VALUE/GAR1(IG)
ENDIF
DELTA(IG)=VALUE-GAR1(IG)
GAR1(IG)=VALUE
20 CONTINUE
ELSE IF(IMOD.EQ.3) THEN
DO 30 IG=IGM,IGP
IF(GAR1(IG).EQ.0.0) THEN
FMULT(IG)=1.0
ELSE
FMULT(IG)=1.0+VALUE/GAR1(IG)
ENDIF
DELTA(IG)=VALUE
GAR1(IG)=GAR1(IG)+VALUE
30 CONTINUE
ELSE IF(IMOD.EQ.4) THEN
DO 40 IG=IGM,IGP
FMULT(IG)=VALUE
DELTA(IG)=GAR1(IG)*(VALUE-1.0)
GAR1(IG)=GAR1(IG)*VALUE
40 CONTINUE
ENDIF
RETURN
END
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