Synopsis
Save the statistical errors to a file.
Syntax
save_staterror(id, filename=None, bkg_id=None, ascii=True, clobber=False)
Description
If the statistical errors have not been set explicitly, then the values calculated by the statistic - such as chi2gehrels or chi2datavar - will be used.
Examples
Example 1
Write out the statistical errors from the default data set to the file 'errs.dat'.
>>> save_staterror('errs.dat')Example 2
Over-write the file it it already exists, and take the data from the data set "jet":
>>> save_staterror('jet', 'err.out', clobber=True)Example 3
Write the data out in FITS format:
>>> save_staterror('staterr.fits', ascii=False)PARAMETERS
The parameters for this function are:
| Parameter | Type information | Definition |
|---|---|---|
| id | int or str, optional | The identifier for the data set to use. If not given then the default identifier is used, as returned by `get_default_id` . |
| filename | str | The name of the file to write the array to. The format is determined by the `ascii` argument. |
| bkg_id | int, str, or None, optional | Set if the background should be written out rather than the source. |
| ascii | bool, optional | If False then 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 `outfile` is not none , then this flag controls whether an existing file can be overwritten ( True ) or if it raises an exception ( False , the default setting). |
Notes
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 `filename` parameter. If given two un-named arguments, then they are interpreted as the `id` and `filename` parameters, respectively. The remaining parameters are expected to be given as named arguments.
The output file contains the columns x and stat_err .
Bugs
See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.
See Also
- contrib
- save_chart_spectrum, save_marx_spectrum
- data
- copy_data, dataspace1d, dataspace2d, datastack, delete_data, fake, get_axes, get_bkg_chisqr_plot, get_bkg_delchi_plot, get_bkg_fit_plot, get_bkg_model_plot, get_bkg_plot, get_bkg_ratio_plot, get_bkg_resid_plot, get_bkg_source_plot, get_counts, get_data, get_data_contour, get_data_contour_prefs, get_data_image, get_data_plot, get_data_plot_prefs, get_dep, get_dims, get_error, get_quality, get_specresp, get_staterror, get_syserror, group, group_adapt, group_adapt_snr, group_bins, group_counts, group_snr, group_width, load_arf, load_arrays, load_ascii, load_bkg, load_bkg_arf, load_bkg_rmf, load_data, load_grouping, load_image, load_multi_arfs, load_multi_rmfs, load_pha, load_quality, load_rmf, load_staterror, load_syserror, load_table, pack_image, pack_pha, pack_table, set_data, set_quality, ungroup, unpack_arf, unpack_arrays, unpack_ascii, unpack_bkg, unpack_data, unpack_image, unpack_pha, unpack_rmf, unpack_table
- filtering
- get_filter, load_filter, set_filter
- info
- get_default_id, list_bkg_ids, list_data_ids, list_response_ids
- modeling
- add_model, add_user_pars, clean, load_table_model, load_template_interpolator, load_template_model, load_user_model, save_model, save_source
- plotting
- plot_data, set_xlinear, set_xlog, set_ylinear, set_ylog
- saving
- restore, save, save_all, save_arrays, save_data, save_delchi, save_error, save_filter, save_grouping, save_image, save_pha, save_quality, save_resid, save_syserror, save_table, script
- statistics
- load_user_stat
- utilities
- calc_data_sum, calc_data_sum2d, calc_ftest, calc_kcorr, calc_mlr, calc_model_sum2d, calc_source_sum2d, get_rate
- visualization
- contour, contour_data, contour_ratio, histogram1d, histogram2d, image_data, rebin