diff options
Diffstat (limited to 'pkg/tbtables/fitsio/ftr4i2.f')
| -rw-r--r-- | pkg/tbtables/fitsio/ftr4i2.f | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/pkg/tbtables/fitsio/ftr4i2.f b/pkg/tbtables/fitsio/ftr4i2.f new file mode 100644 index 00000000..937fd658 --- /dev/null +++ b/pkg/tbtables/fitsio/ftr4i2.f @@ -0,0 +1,161 @@ +C---------------------------------------------------------------------- + subroutine ftr4i2(input,n,scale,zero,tofits, + & chktyp,setval,flgray,anynul,output,status) + +C copy input r*4 values to output i*2 values, doing optional +C scaling and checking for null values + +C input r input array of values +C n i number of values +C scale d scaling factor to be applied +C zero d scaling zero point to be applied +C tofits l true if converting from internal format to FITS +C chktyp i type of null value checking to be done if TOFITS=.false. +C =0 no checking for null values +C =1 set null values = SETVAL +C =2 set corresponding FLGRAY value = .true. +C setval i*2 value to set output array to if value is undefined +C flgray l array of logicals indicating if corresponding value is null +C anynul l set to true if any nulls were set in the output array +C output i*2 returned array of values +C status i output error status (0 = ok) + + real input(*) + integer*2 output(*),setval,mmini2,mmaxi2 + integer n,i,chktyp,status + double precision scale,zero,dval,i2max,i2min + logical tofits,flgray(*),anynul,noscal + logical fttrnn + parameter (i2max=3.276749D+04) + parameter (i2min=-3.276849D+04) + real mini2,maxi2 + parameter (maxi2=32767.49) + parameter (mini2=-32768.49) + parameter (mmaxi2=32767) + parameter (mmini2=-32768) + external fttrnn + + if (status .gt. 0)return + + if (scale .eq. 1. .and. zero .eq. 0)then + noscal=.true. + else + noscal=.false. + end if + + if (tofits) then +C we don't have to worry about null values when writing to FITS + if (noscal)then + do 10 i=1,n +C trap any values that overflow the I*2 range + if (input(i) .le. maxi2 .and. + & input(i) .ge. mini2)then + output(i)=nint(input(i)) + else if (input(i) .gt. maxi2)then + status=-11 + output(i)=mmaxi2 + else + status=-11 + output(i)=mmini2 + end if +10 continue + else + do 20 i=1,n + dval=(input(i)-zero)/scale +C trap any values that overflow the I*2 range + if (dval.lt.i2max .and. dval.gt.i2min)then + output(i)=nint(dval) + else if (dval .ge. i2max)then + status=-11 + output(i)=mmaxi2 + else + status=-11 + output(i)=mmini2 + end if +20 continue + end if + else +C converting from FITS to internal format; may have to check nulls + if (chktyp .eq. 0)then +C don't have to check for nulls + if (noscal)then + do 30 i=1,n +C trap any values that overflow the I*2 range + if (input(i) .le. maxi2 .and. + & input(i) .ge. mini2)then + output(i)=nint(input(i)) + else if (input(i) .gt. maxi2)then + status=-11 + output(i)=mmaxi2 + else + status=-11 + output(i)=mmini2 + end if +30 continue + else + do 40 i=1,n + dval=input(i)*scale+zero +C trap any values that overflow the I*2 range + if (dval.lt.i2max .and. dval.gt.i2min)then + output(i)=nint(dval) + else if (dval .ge. i2max)then + status=-11 + output(i)=mmaxi2 + else + status=-11 + output(i)=mmini2 + end if +40 continue + end if + else +C must test for null values + if (noscal)then + do 50 i=1,n + if (fttrnn(input(i)))then + anynul=.true. + if (chktyp .eq. 1)then + output(i)=setval + else + flgray(i)=.true. + end if + else +C trap any values that overflow the I*2 range + if (input(i) .le. maxi2 .and. + & input(i) .ge. mini2)then + output(i)=nint(input(i)) + else if (input(i) .gt. maxi2)then + status=-11 + output(i)=mmaxi2 + else + status=-11 + output(i)=mmini2 + end if + end if +50 continue + else + do 60 i=1,n + if (fttrnn(input(i)))then + anynul=.true. + if (chktyp .eq. 1)then + output(i)=setval + else + flgray(i)=.true. + end if + else + dval=input(i)*scale+zero +C trap any values that overflow the I*2 range + if (dval.lt.i2max .and. dval.gt.i2min)then + output(i)=nint(dval) + else if (dval .ge. i2max)then + status=-11 + output(i)=mmaxi2 + else + status=-11 + output(i)=mmini2 + end if + end if +60 continue + end if + end if + end if + end |