get_covar¶
- sherpa.ui.get_covar()¶
Return the covariance estimation object.
- Returns
covar
- Return type
See also
covar
Estimate parameter confidence intervals using the covariance method.
get_covar_opt
Return one or all of the options for the covariance method.
set_covar_opt
Set an option of the covar estimation object.
Notes
The attributes of the covariance object include:
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 isFalse
Examples
>>> 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