set_analysis

Synopsis

Set the units for spectral analysis

set_analysis([id], quantity, [type,] [factor])

Description

The set_analysis command sets the units for spectral analysis. Note that in order to change the units of a data set from 'channel' to 'energy' or 'wavelength', the appropriate ARF and RMF instrument response files must be loaded.

• id - the id of the dataset to use; default is to change the analysis setting for all datasets
• quantity - the analysis setting: channel (or "chan" or "bin"), energy (or "ener"), wavelength (or "wave")
• type - unit type for the y-axis of a plot: rate (the default) or counts
• factor - integer indicating the number of times multiplied by energy (dE) or wavelength (dlambda). The default value is 0; values are listed below.

Values for the factor option

• 0 = counts/sec/keV (the default)
• 1 = counts/sec (with quantity="energy")
• 2 = keV counts/sec (with quantity="energy")

Example 1

sherpa> set_analysis("wave")

Set the analysis quantity to wavelength for all datasets.

Example 2

sherpa> set_analysis(2, "chan")

Set the analysis quantity to channel for a dataset id=2.

Example 3

sherpa> set_analysis(1, "ener", "counts", 2)

Set the plot units for dataset id=1 to keV (x-axis) and counts*keV^2 (y-axis).

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_exposure, 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_default_id

visualization

image_setregion