*-- Author : Stephen Burke
SUBROUTINE FFRHNT(ICELL,DRIFT,IWEDGE,JMIN)
*-----------------------------------------Updates 07/09/93-------
**: FFRHNT 40000 SB. New definition of dead wire flag.
*-----------------------------------------Updates 27/07/93-------
**: FFRHNT 30907 RP. Farm changes.
**----------------------------------------------------------------------
**: FFRHNT 30907 SB. Check for bad hits (again).
**----------------------------------------------------------------------
**: FFRHNT 30104 SM. Check for bad hits.
**----------------------------------------------------------------------
**********************************************************************
* *
* Look for a radial digi near a specified point *
* *
* NB The FRRE bank must have been unpacked into FRLC and FRHC, with *
* a pointer to FRLC in INDLC(2) in /FFGEO/ *
* *
**********************************************************************
*KEEP,FKNPL.
CHARACTER*5 CKDBG
PARAMETER (CKDBG='FKDBG')
PARAMETER (NPL=72)
LOGICAL LTRUE,LFIRST,LTRPL,LTRPLD
DOUBLE PRECISION TRUE,RTRUE,CHITRU,SPRO,CPRO,SFIL,CFIL
&, SSMT,CSMT,SSMTR,CSMTR,DPRO,CBPRO,QPRO,QGAIN
&, RPRO,CRPRO,RFIL,CRFIL,RSMT,CRSMT,CHIFIL,CHISMT
*
* Per-track values can go in H1WORK; note that LTRUE and LFIRST must
* be set at least per event.
*
* This is about 36k words long; the remaining common blocks are
* about 3.6k in total. Some of this could be in /H1WORK/, but the
* blocks would have to be reorganised.
*
COMMON /H1WORK/
* /FKPROJ/
& SPRO(5,NPL),CPRO(5,5,NPL)
* /FKFILT/
&, SFIL(5,NPL),CFIL(5,5,NPL)
* /FKSMTH/
&, SSMT(5,NPL),CSMT(5,5,NPL)
&, SSMTR(5,NPL),CSMTR(5,5,NPL)
* /FKINT/
&, DPRO(5,5,NPL),CBPRO(5,5,NPL),QPRO(5,5,NPL)
&, QGAIN(5,5,NPL),IAPROX,LFIRST
* /FKRSID/
&, RPRO(2,NPL),CRPRO(2,2,NPL),RFIL(2,NPL)
&, CRFIL(2,2,NPL),RSMT(2,NPL),CRSMT(2,2,NPL)
&, CHIFIL(NPL),CHISMT(NPL)
* /FKTRUE/
&, TRUE(5,NPL),RTRUE(5,NPL),CHITRU(NPL),LTRUE
* /FKDBG/
&, LTRPL(NPL),LTRPLD(NPL)
*KEEP,FFGEO.
COMMON /FFGEO/ INDG1(2),INDLC(2),IDIGI(NPL)
*KEEP,BCS.
INTEGER NHROW,NHCOL,NHLEN
PARAMETER (NHROW = 2, NHCOL = 1, NHLEN=2)
INTEGER NBOSIW
PARAMETER (NBOSIW=1000000)
INTEGER IW(NBOSIW)
REAL RW(NBOSIW)
COMMON /BCS/ IW
EQUIVALENCE (RW(1),IW(1))
SAVE /BCS/
*KEEP,CNSTBF.
INTEGER LW(NBOSIW)
REAL SW(NBOSIW)
EQUIVALENCE (RW(1),IW(1),LW(1),SW(1))
*KEEP,STFUNCT.
* index of element before row number IROW
INDR(IND,IROW)=IND+2+IW(IND+1)*(IROW-1)
* index of L'th element of row number IROW
INDCR(IND,L,IROW)=INDR(IND,IROW) + L
* L'th integer element of the IROW'th row of bank with index IND
IBTAB(IND,L,IROW)=IW(INDCR(IND,L,IROW))
* L'th real element of the IROW'th row of bank with index IND
RBTAB(IND,L,IROW)=RW(INDCR(IND,L,IROW))
*KEEP,STFCLW.
* statement functions acting on the BOS COMMON LW
* index of element before row number LWROW
LNDR(LND,LWROW) = LND + 2 + LW(LND+1)*(LWROW-1)
* index of L-th element of row number LWROW
LNDCR(LND,L,LWROW)=LNDR(LND,LWROW)+L
* L-th integer element of the LWROW'th row in bank with index LND
LBTAB(LND,L,LWROW)=LW(LNDCR(LND,L,LWROW))
* L-th real element of the LWROW'th row in bank with index LND
SBTAB(LND,L,LWROW)=SW(LNDCR(LND,L,LWROW))
*
*KEND.
**********************************************************************
JMIN = 0
INDHC = NLINK('FRHC',0)
IF (INDHC.LE.0 .OR. INDG1(2).LE.0 .OR. INDLC(2).LE.0) RETURN
* Check for dead wires
IDEAD = LBTAB(INDG1(2),1,ICELL+1)
IF (IDEAD.EQ.1 .OR. IDEAD.EQ.IWEDGE+2) RETURN
NHIT = IBTAB(INDHC,1,ICELL+1)
J1 = IBTAB(INDHC,2,ICELL+1)
*
* Find the hit with the minimum difference between its drift and
* the target drift. Since the resolution is 150 um and the two-track
* resolution is 2 mm there is never any ambiguity; also no need to
* look at the radius.
*
DDMIN = 1.E10
DO 100 JDIG=J1,J1+NHIT-1
DD = RBTAB(INDLC(2),2,JDIG)
DDD = ABS(ABS(DD) - ABS(DRIFT))
IF (DDD.LT.DDMIN) THEN
DDMIN = DDD
JMIN = JDIG
ENDIF
100 CONTINUE
* Check that it's the right wedge, and the hit is OK
ISGNW = IBTAB(INDLC(2),6,JMIN)
IF (JBIT(ISGNW,1).NE.IWEDGE) JMIN = 0
IF (JBIT(ISGNW,8).EQ.1) JMIN = 0
RETURN
END
*