Synopsis
Load a data set from a file.
Syntax
load_data(id, filename=None, *args, **kwargs) id - int or str, optional
Description
This loads a data set from the file, trying in order `load_pha` , `load_image` , `load_table` , then `load_ascii` .
Examples
Example 1
>>> load_data('tbl.dat')Example 2
>>> load_data('hist.dat', dstype=Data1DInt)Example 3
>>> load_data('img', 'img.fits')
>>> load_data('bg', 'img_bg.fits')Example 4
>>> cols = ['rmid', 'sur_bri', 'sur_bri_err'] >>> load_data(2, 'profile.fits', colkeys=cols)
PARAMETERS
The parameters for this function are:
| Parameter | Definition |
|---|---|
| id | The identifier for the data set to use. For multi-dataset files, currently only PHA2, the id value indicates the first dataset: if it is an integer then the numbering starts at id, and if a string then a suffix of 1 to n is added. If not given then the default identifier is used, as returned by `get_default_id` . |
| filename | A file name or a data structure representing the data to use, as used by the I/O backend in use by Sherpa: e.g. a phacratedataset , tablecrate , or imagecrate for crates, as used by CIAO, or a list of AstroPy HDU objects. |
| args | The arguments supported by `load_pha` , `load_image` , `load_table` , and `load_ascii` . |
| kwargs | The keyword arguments supported by `load_pha` , `load_image` , `load_table` , and `load_ascii` . |
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.
Changes in CIAO
Changed in CIAO 4.14
The id argument is now used to define the first identifier when loading in a PHA2 file to match `load_pha` (previously the range always started at 1).
Bugs
See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.
See Also
- 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_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
- save_arrays, save_data, save_delchi, save_error, save_filter, save_grouping, save_image, save_pha, save_quality, save_resid, save_staterror, save_syserror, save_table
- 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