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C----------------------------------------------------------------------------
subroutine ftgsvd(iunit,colnum,naxis,naxes,blc,trc,inc,
& nulval,array,anynul,status)
C read a subsection of double precision data values from an image or
C a table column.
C iunit i fortran unit number
C colnum i number of the column to read from
C naxis i number of dimensions in the FITS array
C naxes i size of each dimension.
C blc i 'bottom left corner' of the subsection to be read
C trc i 'top right corner' of the subsection to be read
C inc i increment to be applied in each dimension
C nulval i value that undefined pixels will be set to
C array i array of data values that are read from the FITS file
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 1993
integer iunit,colnum,naxis,naxes(*),blc(*),trc(*),inc(*),status
double precision array(*),nulval
logical anynul,anyf
C-------COMMON BLOCK DEFINITIONS:--------------------------------------------
integer nb,ne
parameter (nb = 20)
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
C-------END OF COMMON BLOCK DEFINITIONS:------- -----------------------------
integer i,i1,i2,i3,i4,i5,i6,i7,i8,i9,row,rstr,rstp,rinc
integer str(9),stp(9),incr(9),dsize(10)
integer felem,nelem,nultyp,ninc,ibuff,numcol
logical ldummy
character caxis*20
C this routine is set up to handle a maximum of nine dimensions
if (status .gt. 0)return
if (naxis .lt. 1 .or. naxis .gt. 9)then
status=320
write(caxis,1001)naxis
1001 format(i20)
call ftpmsg('NAXIS ='//caxis//' in the call to FTGSVD '
& //'is illegal.')
return
end if
C if this is a primary array, then the input COLNUM parameter should
C be interpreted as the row number, and we will alway read the image
C data from column 2 (any group parameters are in column 1).
ibuff=bufnum(iunit)
if (hdutyp(ibuff) .eq. 0)then
C this is a primary array, or image extension
if (colnum .eq. 0)then
rstr=1
rstp=1
else
rstr=colnum
rstp=colnum
end if
rinc=1
numcol=2
else
C this is a table, so the row info is in the (naxis+1) elements
rstr=blc(naxis+1)
rstp=trc(naxis+1)
rinc=inc(naxis+1)
numcol=colnum
end if
nultyp=1
anynul=.false.
i1=1
do 5 i=1,9
str(i)=1
stp(i)=1
incr(i)=1
dsize(i)=1
5 continue
do 10 i=1,naxis
if (trc(i) .lt. blc(i))then
status=321
write(caxis,1001)i
call ftpmsg('In FTGSVD, the range specified for axis '//
& caxis(19:20)//' has the start greater than the end.')
return
end if
str(i)=blc(i)
stp(i)=trc(i)
incr(i)=inc(i)
dsize(i+1)=dsize(i)*naxes(i)
10 continue
if (naxis .eq. 1 .and. naxes(1) .eq. 1)then
C This is not a vector column, so read all the rows at once
nelem=(rstp-rstr)/rinc+1
ninc=rinc
rstp=rstr
else
C have to read each row individually, in all dimensions
nelem=(stp(1)-str(1))/inc(1)+1
ninc=incr(1)
end if
do 100 row=rstr,rstp,rinc
do 90 i9=str(9),stp(9),incr(9)
do 80 i8=str(8),stp(8),incr(8)
do 70 i7=str(7),stp(7),incr(7)
do 60 i6=str(6),stp(6),incr(6)
do 50 i5=str(5),stp(5),incr(5)
do 40 i4=str(4),stp(4),incr(4)
do 30 i3=str(3),stp(3),incr(3)
do 20 i2=str(2),stp(2),incr(2)
felem=str(1)+(i2-1)*dsize(2)+(i3-1)*dsize(3)+(i4-1)*dsize(4)
& +(i5-1)*dsize(5)+(i6-1)*dsize(6)+(i7-1)*dsize(7)
& +(i8-1)*dsize(8)+(i9-1)*dsize(9)
call ftgcld(iunit,numcol,row,felem,nelem,ninc,
& nultyp,nulval,array(i1),ldummy,anyf,status)
if (status .gt. 0)return
if (anyf)anynul=.true.
i1=i1+nelem
20 continue
30 continue
40 continue
50 continue
60 continue
70 continue
80 continue
90 continue
100 continue
end
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