Causes Sherpa to undo a grouping scheme that had been applied to
source or background data.
sherpa> [B]UNGROUP [# [ID]]
UNGROUP is used to ungroup source data, while BUNGROUP is used to
ungroup background data.
# specifies the number of the dataset to which the grouping scheme is
to be applied (default dataset number is 1). The ID modifier is used if
and only if the Sherpa state object variable multiback is set to 1,
i.e., if more than one background dataset is to be associated with a
single source dataset. The ID modifier may be any unreserved string
(e.g., A, foo, etc.), i.e., a string that is not a parsable command.
The commands GROUP and
UNGROUP
allow a user to toggle back and forth between the analysis
of grouped and ungrouped data, after grouping assignments have been
read into Sherpa via the command
READ GROUPS.
(In a future version of Sherpa, the GROUP
may be issued automatically upon the reading in of groups.)
Note the issuing the UNGROUP causes Sherpa
to delete any defined filters for the specified dataset.
NOTE:
in CIAO 3.0,
the commands GROUP and UNGROUP may
not be used with PHA data that has a GROUPING column.
This is because these data are grouped before Sherpa ever
has control of them, and Sherpa thus has no knowledge
of how the ungrouped data are distributed among bins. This will be
changed in a future version of Sherpa.
See the documentation on the
GROUP command for more details and
an example.
- chandra
-
guide
- sherpa
-
autoest,
back,
berrors,
bsyserrors,
coord,
data,
dataspace,
fakeit,
feffile,
group,
guess,
is_subtracted,
load,
load_arf,
load_ascii,
load_back_from,
load_backset,
load_dataset,
load_fitsbin,
load_image,
load_inst,
load_inst_from,
load_pha,
load_pha2,
load_rmf,
read,
set_analysis,
set_axes,
set_backscale,
set_coord,
set_data,
set_exptime,
set_subtract,
set_weights,
setback,
setdata,
subtract,
unsubtract,
use
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