composite tow file

[hossein lotfi]

Hi All Users
I hav 2 nc file(T.nc & P.nc) and I want to write this formula for these
file:
'X=(P/T+10)' and
'display X'
but I don't do it
after open tow files in grads I set the same lat and lon for both files and
define variable of file2 suach as   'define  T=air_temp'    (air_temp is the
variable of file 2)
and then write  'd P/(T+10)'  but  result is not correct
please help me
thank you
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