C-------------------------------------------------------------------------- subroutine ftgclm(iunit,colnum,frow,felem,nelem,eincr, & nultyp,nulval,array,flgval,anynul,status) C read an array of double complex data values from the specified C column of the table. C This general purpose routine will handle null values in one C of two ways: if nultyp=1, then undefined array elements will be C set equal to the input value of NULVAL. Else if nultyp=2, then C undefined array elements will have the corresponding FLGVAL element C set equal to .TRUE. If NULTYP=1 and NULVAL=0, then no checks for C undefined values will be made, for maximum efficiency. C The binary table column being read to must have datatype 'M' C and no datatype conversion will be perform if it is not. C iunit i fortran unit number C colnum i number of the column to read from C frow i first row to read C felem i first element within the row to read C nelem i number of (pairs) elements to read C eincr i element increment C nultyp i input code indicating how to handle undefined values C nulval d value that undefined pixels will be set to (if nultyp=1) C array d array of data values that are read from the FITS file C flgval l set .true. if corresponding element undefined (if nultyp=2) C anynul l set to .true. if any of the returned values are undefined C status i output error status C C written by Wm Pence, HEASARC/GSFC, June 1991 integer iunit,colnum,frow,felem,nelem,eincr,nultyp,status double precision array(*),nulval(2) logical flgval(*),anynul C COMMON BLOCK DEFINITIONS:-------------------------------------------- integer nf,nb,ne parameter (nb = 20) parameter (nf = 3000) parameter (ne = 200) integer bufnum,chdu,hdutyp,maxhdu,hdstrt,hdend,nxthdr,dtstrt integer nxtfld logical wrmode common/ft0001/bufnum(199),chdu(nb),hdutyp(nb),maxhdu(nb), & wrmode(nb),hdstrt(nb,ne),hdend(nb),nxthdr(nb),dtstrt(nb),nxtfld integer tfield,tstart,tbcol,rowlen,tdtype,trept,tnull,scount integer theap,nxheap double precision tscale,tzero common/ft0002/tfield(nb),tstart(nb),tbcol(nf),rowlen(nb), & tdtype(nf),trept(nf),tscale(nf),tzero(nf),tnull(nf),scount(nb) & ,theap(nb),nxheap(nb) C END OF COMMON BLOCK DEFINITIONS----------------------------------- integer bytpix,bstart,tcode,nulchk,incre integer ibuff,i1,ntodo,itodo,repeat,rstart,estart integer offset,rskip,dstart,begcol,lenrow,i,j logical scaled,descrp double precision scale,zero character crow*9,cp1*9,cp2*9,ccol*4 if (status .gt. 0)return C check for zero length array or bad first row number if (nelem .le. 0)return if (frow .lt. 1)then C error: illegal first row number status=307 write(crow,2000)frow 2000 format(i9) call ftpmsg('Starting row number for table read '// & 'request is out of range:'//crow//' (FTGCLM).') return end if if (felem .lt. 1)then C illegal element number status=308 write(crow,2000)felem call ftpmsg('Starting element number for read '// & 'request is out of range:'//crow//' (FTGCLM).') return end if i1=1 ntodo=nelem estart=felem-1 rstart=frow-1 anynul=.false. ibuff=bufnum(iunit) dstart=dtstrt(ibuff) lenrow=rowlen(ibuff) begcol=tbcol(colnum+tstart(ibuff)) tcode=tdtype(colnum+tstart(ibuff)) scale=tscale(colnum+tstart(ibuff)) zero=tzero(colnum+tstart(ibuff)) bytpix=16 C determine the repeat count and the first element position C incre is the byte offset between consecutive pixels incre=bytpix*eincr if (tcode .eq. 163)then descrp=.false. repeat=trept(colnum+tstart(ibuff)) if (felem .gt. repeat)then C illegal element number status=308 write(crow,2000)felem call ftpmsg('Starting element number for read '// & 'request is out of range:'//crow//' (FTGCLM).') return end if if (repeat .eq. 1 .and. nelem .gt. 1)then C read multiple rows of data at one time by C fooling it into thinking that this is a vector C column with a large value of bytes per pixel dstart=dstart+rstart*lenrow rstart=0 estart=0 repeat=nelem*eincr incre=lenrow*eincr lenrow=lenrow*repeat end if else if (tcode .eq. -163)then C this is a variable length descriptor column C read the number of elements and the starting offset: descrp=.true. call ftgdes(iunit,colnum,frow,repeat,offset,status) if (repeat .eq. 0)then C error: null length vector status=318 return else if (estart+(nelem-1)*eincr+1 .gt. repeat) then C error: trying to read beyond end of record status=319 return end if C define the starting point of the row dstart=dstart+offset+theap(ibuff) rstart=0 begcol=0 else C column must be double complex data type status=312 write(ccol,2001)colnum call ftpmsg('Column'//ccol//' does not have '// & 'Double Precision Complex (M) data type (FTGCLM).') return end if C determine if we have to check for null values if (nultyp .eq. 1 .and. nulval(1) .eq. 0 .and. & nulval(2) .eq. 0)then C user doesn't want to check for nulls nulchk=0 else C user does want to check for null values nulchk=nultyp end if C check if scaling is required if (scale .eq. 1.0 .and. zero .eq. 0.)then scaled=.false. else scaled=.true. end if C process as many contiguous pixels as possible, up to buffer size 20 itodo=min(ntodo,(repeat-estart-1)/eincr+1) C move the i/o pointer to the start of the sequence of pixels bstart=dstart+rstart*lenrow+begcol+estart*bytpix call ftmbyt(iunit,bstart,.false.,status) C read the data if (incre .eq. 16)then C the data values are contiguous in the FITS file C multiply itodo*2 because we are getting pairs of values call ftgr8b(iunit,itodo*2,8,array(i1),status) else C have to read each complex double pair one by one j=i1 call ftgr8b(iunit,2,8,array(j),status) j=j+2 do 25 i=2,itodo call ftmoff(iunit,incre-16,.false.,status) call ftgr8b(iunit,2,8,array(j),status) j=j+2 25 continue end if C find number of pixels left to do, and process them 30 ntodo=ntodo-itodo if (status .gt. 0)then write(ccol,2001)colnum 2001 format(i4) if (descrp)then C this is a variable length descriptor column write(crow,2000)frow write(cp1,2000)felem+i1-1 write(cp2,2000)felem+i1+itodo-2 call ftpmsg('Error reading elements'//cp1//' to'//cp2 & //' in row'//crow) call ftpmsg(' of variable length vector column'//ccol & //' (FTGCLM.') else if (trept(colnum+tstart(ibuff)) .eq. 1)then C this is not a vector column (simple case) write(cp1,2000)frow+i1-1 write(cp2,2000)frow+i1+itodo-2 call ftpmsg('Error reading rows'//cp1//' to'//cp2 & //' of column'//ccol//' (FTGCLM).') else C this is a vector column (more complicated case) write(crow,2000)rstart+1 write(cp1,2000)estart+1 write(cp2,2000)itodo call ftpmsg('Error reading'//cp2//' elements from' & //' column'//ccol) call ftpmsg(' starting at row'//crow & //', element'//cp1//' (FTGCLM).') end if return end if if (ntodo .gt. 0)then C increment the pointers i1=i1+itodo*2 estart=estart+itodo*eincr rskip=estart/repeat rstart=rstart+rskip estart=estart-rskip*repeat go to 20 end if C check for null values and/or scale the values if (nulchk .ne. 0 .or. scaled)then call ftnulm(array,nelem,nulchk,nulval,flgval,anynul, & scaled,scale,zero) end if end