partab problems in iraf/linux

Raymundo Baptista wrote on Sep 16, 1998

Hi there,

I'm having a problem in trying to use the task 'partab'. I am running iraf
v2.10.4 in a linux/slackware 2.3 pentium. I am trying to use a script to
handle apperture photometry which works fine in our solaris version of
iraf but simply doesn't work in the linux one. I have an stsdas table,

tt> tprint table    
#  Table table.tab  Wed 22:13:57 16-Sep-98

# row              id             mag            merr
#                                                    

    1              1.           INDEF            0.02
    2              2.          15.325            0.01
    3              3.          16.591           0.024
    4              4.          16.779           0.027
    5              5.          16.933           0.031
    6              6.          17.024           0.034

and I wish to replace the values in column 'mag' by the difference between
the magnitude of first star (row #1) and that of the current row.
I have a script which does this in the following way,

procedure deltamag(table)

char table

begin

file tabela
real mcomp,aux
int j,nrows

tabela=table
tinfo(tabela)
nrows = tinfo.nrows
tabpar(tabela,'mag',1)
mcomp = real(tabpar.value)
for (j=2; j<=nrows ; j=j+1)
{
	tabpar(tabela,'mag',j)
	aux = real(tabpar.value) - mcomp
	partab.value=aux
	partab(aux,tabela,'mag',j) 
}
end


However, when I try to use partab to do the job I always get a funny
result like this below,

tt> partab 1.0 table 'mag' 2
ERROR: floating point exception

Partab simply doesn't work, neither from within the script nor from the cl
prompt. I would appreciate having some hint on where the problem might be.

Thanks in advance for you kind attention,

Best regards,
Raymundo Baptista

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Last post on Sep 16, 1998