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*DECK MCGDSP
SUBROUTINE MCGDSP(N,NFI,NLONG,LC,NZON,NOM,KM,MCU,IM,PREV,NEXT)
*
*-----------------------------------------------------------------------
*
*Purpose:
* Calculation of the position of the coefficients relative to a track
* in ACA matrices. Non-cylic tracking version.
*
*Copyright:
* Copyright (C) 2002 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): I. Suslov and R. Le Tellier
*
*Parameters: input
* N number of elements in the current track.
* NFI total number of volumes and surfaces.
* NLONG total number of cells with unknowns quantities.
* LC dimension of vector MCU.
* NZON index-number of the mixture type assigned to each volume.
* NOM integer tracking elements.
* KM used in CDD acceleration.
* MCU used in CDD acceleration.
* IM used in CDD acceleration.
*
*Parameters: output
* PREV PREV(I) location of non diagonal element (NOM(I),NOM(I-1))
* of preconditioning matrices in vector CF and CQ.
* NEXT NEXT(I) location of non diagonal element (NOM(I),NOM(I+1))
* of preconditioning matrices in vector CF and CQ.
*
*-----------------------------------------------------------------------
*
IMPLICIT NONE
*----
* SUBROUTINE ARGUMENTS
*----
INTEGER N,NFI,NLONG,LC,NZON(NFI),NOM(N),KM(NLONG),MCU(LC),
1 IM(NLONG),PREV(N),NEXT(N)
*----
* LOCAL VARIABLES
*----
INTEGER I,I1,I2,II,FOUN,FOUP,NOMI,NOMIN,NOMIP,NZI
*----
* CONSTRUCT PREV & NEXT
*----
DO I=1,N
FOUN=-1
FOUP=-1
* current cell
NOMI=NOM(I)
IF((NOMI.LT.1).OR.(NOMI.GT.NFI)) THEN
write(6,*) 'NOMI= ',NOMI,' I= ',I,' NFI= ',NFI
CALL XABORT('MCGDSP: KM OVERFLOW.')
ENDIF
I1=IM(NOMI)
* next cell
IF(I.EQ.N) THEN
NOMIN=-1
ELSE
NOMIN=NOM(I+1)
ENDIF
* previous cell
IF(I.EQ.1) THEN
NOMIP=-1
ELSE
NOMIP=NOM(I-1)
ENDIF
*
NZI=NZON(NOMI)
IF (NOMI.EQ.NOMIN) THEN
IF (NZI.GE.0) THEN
FOUN=0
ELSE
NOMIN=-1
ENDIF
ENDIF
IF (NOMI.EQ.NOMIP) THEN
IF (NZI.GE.0) THEN
FOUP=0
ELSE
NOMIP=-1
ENDIF
ENDIF
*
I2=I1+KM(NOMI)
I1=I1+1
DO II=I1,I2
IF ((FOUN.LT.0).AND.(MCU(II).EQ.NOMIN)) THEN
FOUN=II
ENDIF
IF ((FOUP.LT.0).AND.(MCU(II).EQ.NOMIP)) THEN
FOUP=II
ENDIF
IF ((FOUN.GE.0).AND.(FOUP.GE.0)) GOTO 10
ENDDO
* connectivity between NOMI and NOMIN and/or NOMIP not found
WRITE(6,100) I,NOMI,NOMIN,NOMIP
CALL PRINIM('NOM ',NOM(1),N)
CALL PRINIM('MCU ',MCU(I1),KM(NOMI))
! CALL XABORT('MCGDSP: FAILURE 1.')
10 IF ((FOUN.LE.LC).AND.(FOUP.LE.LC)) THEN
PREV(I)=FOUP
NEXT(I)=FOUN
ELSE
CALL XABORT('MCGDSP: CQ/CF OVERFLOW.')
ENDIF
ENDDO
*
100 FORMAT(1X,'I=',I3,' NOMI=',I5,' NOMIN=',I5,' NOMIP=',I5)
*
RETURN
END
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