freeze
- sherpa.ui.freeze(*args)
Fix model parameters so they are not changed by a fit.
The arguments can be parameters or models, in which case all parameters of the model are frozen. If no arguments are given then nothing is changed.
See also
Notes
The
thaw
function can be used to reverse this setting, so that parameters can be varied in a fit.Examples
Fix the FWHM parameter of the line model (in this case a
gauss1d
model) so that it will not be varied in the fit.>>> set_source(const1d.bgnd + gauss1d.line) >>> line.fwhm = 2.1 >>> freeze(line.fwhm) >>> fit()
Freeze all parameters of the line model and then re-fit:
>>> freeze(line) >>> fit()
Freeze the nh parameter of the gal model and the abund parameter of the src model:
>>> freeze(gal.nh, src.abund)