get_rate

Synopsis

Return the count rate of a PHA data set.

Syntax

get_rate(id=None, filter=False, bkg_id=None)

id - int or str, optional
filter - bool, optional
bkg_id - int or str, optional

Description

Return an array of count-rate values for each bin in the data set. The units of the returned values depends on the values set by the `set_analysis` rountine for the data set.

Examples

Example 1

Return the count-rate for the default data set. For a PHA data set, where `set_analysis` has not been called, the return value will be in units of count/second/keV, and a value for each group in the data set is returned.

>>> rate = get_rate()

Example 2

The return value is grouped to match the data, but is not filtered (with the default `filter` argument). The data set used here 46 groups in it, but after filtering only has 40 groups, but the call to `get_rate` returns a 46-element array unless `filter` is explicitly set to `True` :

>>> notice()
>>> get_rate().size
46
>>> ignore(None, 0.5)
>>> ignore(7, None)
>>> get_rate().size
46
>>> get_rate(filter=True).size
40

Example 3

The rate of data set 2 will be in units of count/s/Angstrom and only cover the range 20 to 22 Angstroms:

>>> set_analysis(2, 'wave')
>>> notice_id(2, 20, 22)
>>> r2 = get_rate(2, filter=True)

Example 4

The returned rate is now in units of count/s (the return value is multiplied by `binwidth^factor` , where `factor` is normally 0):

>>> set_analysis(2, 'wave', factor=1)
>>> r2 = get_rate(2, filter=True)

Example 5

Return the count rate for the second background component of data set "grating":

>>> get_rate(id="grating", bkg_id=2)

PARAMETERS

The parameters for this function are:

Parameter	Definition
id	The identifier for the data set to use. If not given then the default identifier is used, as returned by `get_default_id` .
filter	Should the filter attached to the data set be applied to the return value or not. The default is False .
bkg_id	Set if the rate should be taken from the background associated with the data set.

Return value

The return value from this function is:

rate -- The rate array. The output matches the grouping of the data set. The units are controlled by the `set_analysis` setting for this data set; that is, the units used in `plot_data` , except that the `type` argument to `set_analysis` is ignored. The return array will match the grouping scheme applied to the data set.

Bugs

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