- sherpa.astro.ui.save_grouping(id, filename=None, bkg_id=None, ascii=True, clobber=False)
Save the grouping scheme to a file.
The output is a two-column file, containing the channel and grouping columns from the data set.
ascii (bool, optional) – If
Falsethen the data is written as a FITS format binary table. The default is
True. The exact format of the output file depends on the I/O library in use (Crates or AstroPy).
clobber (bool, optional) – If
None, then this flag controls whether an existing file can be overwritten (
True) or if it raises an exception (
False, the default setting).
sherpa.utils.err.IOErr – If
filenamealready exists and
The function does not follow the normal Python standards for parameter use, since it is designed for easy interactive use. When called with a single un-named argument, it is taken to be the
filenameparameter. If given two un-named arguments, then they are interpreted as the
filenameparameters, respectively. The remaining parameters are expected to be given as named arguments.
The column names are ‘CHANNEL’ and ‘GROUPS’.
Save the channel and grouping columns from the default data set to the file ‘group.dat’ as an ASCII file:
Over-write the ‘grp.fits’ file, if it exists, and write out the grouping data from the ‘jet’ data set, as a FITS format file:
>>> save_grouping('jet', 'grp.fits', ascii=False, clobber=True)