Module function to determine if whether the specified dataset is background-subtracted.
Integer_Type is_subtracted([Integer_Type])
Arguments:
(1) Dataset number (default 1)
This function returns 1 if the background has been subtracted in
the specified source dataset.
See the related Sherpa commands
SUBTRACT and
UNSUBTRACT for more information.
Determine if dataset 1 is background subtracted:
sherpa> DATA example.pha
The inferred file type is PHA. If this is not what you want, please
specify the type explicitly in the data command.
WARNING: using systematic errors specified in the PHA file.
RMF is being input from:
<directory_path>/example2.rmf
ARF is being input from:
<directory_path>/example2.arf
Background data are being input from:
<directory_path>/example2_bkg.pha
sherpa> is_subtracted
0
sherpa> SUBTRACT
sherpa> is_subtracted(1)
1
The 0 returned from the first call indicates that no, dataset 1 is
not background subtracted. (Unlike XSPEC,
Sherpa does not automatically subtract background
data upon input.)
The 1 returned from the second call, issued after the
SUBTRACT command, indicates that yes, dataset 1 is
now background-subtracted.
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