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*DECK MCGTMT
SUBROUTINE MCGTMT(NMERG,NTRTMT,NSETMT,NSEG,NSEG0,NOM,NOM0,WEIGHT,
1 WEIGHT0,H,H0,LFORC,NTPROC)
*
*-----------------------------------------------------------------------
*
*Purpose:
* Track merging.
*
*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): R. Le Tellier
*
*Parameters: input
* NMERG number of merged tracks for the track under contruction.
* NTRTMT total number of finalized tracks.
* NSETMT total number of segments in finalized tracks.
* NSEG number of segments in the track to be processed.
* NSEG0 number of segments in the track under construction.
* NOM0 integer tracking elements for the under construction.
* WEIGHT0 weight of the under construction.
* H real tracking elements for the track to be processed.
* LFORC flag to force a merged track to be finalized.
*
*Parameters: input/output
* NOM integer tracking elements for the finalized track.
* WEIGHT weight of the finalized track.
* H0 real tracking elements for the finalized track.
*
*Parameters: output
* NTPROC number of merged tracks for the finalized track.
*
*-----------------------------------------------------------------------
*
IMPLICIT NONE
*----
* SUBROUTINE ARGUMENTS
*----
INTEGER NMERG,NTRTMT,NSETMT,NSEG,NSEG0,NOM(NSEG),
1 NOM0(NSEG),NTPROC
DOUBLE PRECISION WEIGHT,H(NSEG),WEIGHT0,H0(NSEG)
LOGICAL LFORC
*----
* LOCAL VARIABLES
*----
INTEGER II,NTEMP
DOUBLE PRECISION TEMP
*
IF (NMERG.GT.0) THEN
IF ((LFORC).OR.(NSEG.NE.NSEG0)) GOTO 20
DO II=1,NSEG
IF (NOM(II).NE.NOM0(II)) GOTO 20
ENDDO
* merge this track with the previous one
DO II=1,NSEG
H0(II)=H0(II)+WEIGHT*H(II)
ENDDO
WEIGHT0=WEIGHT0+WEIGHT
ELSE
* start
DO II=1,NSEG
H0(II)=WEIGHT*H(II)
NOM0(II)=NOM(II)
ENDDO
WEIGHT0=WEIGHT
ENDIF
NMERG=NMERG+1
NSEG0=NSEG
NTPROC=0
RETURN
20 CONTINUE
* finalize this "merged" track and start a new one
NTRTMT=NTRTMT+1
NSETMT=NSETMT+NSEG0
DO II=1,MAX(NSEG0,NSEG)
TEMP=H(II)
H(II)=H0(II)/WEIGHT0
H0(II)=WEIGHT*TEMP
NTEMP=NOM(II)
NOM(II)=NOM0(II)
NOM0(II)=NTEMP
ENDDO
NTPROC=NMERG
NMERG=1
TEMP=WEIGHT
WEIGHT=WEIGHT0
WEIGHT0=TEMP
NTEMP=NSEG
NSEG=NSEG0
NSEG0=NTEMP
RETURN
END
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