Writing out data to a fileĀ
Sherpa contains a number of routines that will write out data to a file. Most functions support writing out both ASCII and FITS binary files.
Writing out columns
The save_arrays is different to the other routines discussed here, in that you give it the columns to write out, rather than writing out a particular type of data, such as PHA or a data set.
The following will will create an ASCII and FITS binary table containing the independent and dependent axes of the default dataset as displayed by plot_data:
sherpa> dplot = get_data_plot() sherpa> cols = [dplot.x, dplot.y] sherpa> names = ["x", "y"] sherpa> save_arrays("src.dat", cols, fields=names) sherpa> save_arrays("src.fits", cols, fields=names, ascii=False)
Writing out data
The save_data, save_image, and save_table, functions will write out the basic components of a dataset.
Additional columns can be saved with one or more of: save_delchi, save_error, save_filter, save_resid, save_staterror, and save_syserror.
Evaluated models
The save_model and save_source functions will evaluate the model and write out the results, similar to the plot_model and plot_source calls.
PHA data
The save_arf, save_pha, and save_rmf routines will write out ARF, PHA, or RMF data.
The save_grouping and save_quality functions will write out the grouping and quality arrays, such as those created by calls to group_counts or group_snr.
Other commands
The save_all function is used to write out a Python file that will attempt to re-create the current session.