    Return the covariance estimation object.

get_covar()
>>> print(get_covar()) name = covariance sigma = 1 maxiters = 200 soft_limits = False eps = 0.01

Change the sigma field to 1.9.

>>> cv = get_covar() >>> cv.sigma = 1.6

Notes

The attributes of the covariance object include:

Item
Definition
eps
The precision of the calculated limits. The default is 0.01.
maxiters
The maximum number of iterations allowed before stopping for that parameter. The default is 200.
sigma
What is the error limit being calculated. The default is 1.
soft_limits
Should the search be restricted to the soft limits of the parameters ( True ), or can parameter values go out all the way to the hard limits if necessary ( False ). The default is False

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

December 2023