set_exposure

Synopsis

Set the exposure time

set_exposure([id], exptime, [bkg_id])

Description

The set_exposure command sets the exposure time for the dataset. The specified exposure time replaces the current value of the exposure time, which may have been set from the value of the "EXPTIME" header keyword when the dataset was loaded.

• id - the id of the dataset to use; if not given, uses the default dataset id (id=1 by default, see "ahelp get_default_id")
• exptime - the exposure time [s]
• bkg_id - the id of the background, if setting the background value; default=None

Example 1

sherpa> set_exposure(10e5)

Set the exposure time of the default dataset to 10e5 s.

Example 2

sherpa> set_exposure(2, 38500)

Set the exposure time for dataset id=2 to 38500 s.

Example 3

sherpa> set_exposure(1, 10e5, 1)

Set the exposure time for the first background of dataset id=1 to 10e5 s.

Bugs

See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.

See Also

confidence

set_conf_opt, set_covar_opt, set_proj_opt

data

set_areascal, set_arf, set_backscal, set_bkg, set_coord, set_counts, set_data, set_grouping, set_quality, set_rmf, set_staterror, set_syserror

filtering

set_filter

methods

set_iter_method, set_iter_method_opt, set_method, set_method_opt

modeling

get_par, set_bkg_model, set_full_model, set_par, set_pileup_model, set_source, set_xsabund, set_xscosmo, set_xsxsect, set_xsxset

statistics

set_prior, set_sampler, set_sampler_opt, set_stat

utilities

set_analysis, set_default_id

visualization

image_setregion