thaw
- sherpa.astro.ui.thaw(*args)
Allow model parameters to be varied during a fit.
The arguments can be parameters or models, in which case all parameters of the model are thawed. If no arguments are given then nothing is changed.
See also
Notes
The
freeze
function can be used to reverse this setting, so that parameters are “frozen” and so remain constant during a fit.Certain parameters may be marked as “always frozen”, in which case using the parameter in a call to
thaw
will raise an error. If the model is sent tothaw
then the “always frozen” parameter will be skipped.Examples
Ensure that the FWHM parameter of the line model (in this case a
gauss1d
model) will be varied in any fit.>>> set_source(const1d.bgnd + gauss1d.line) >>> thaw(line.fwhm) >>> fit()
Thaw all parameters of the line model and then re-fit:
>>> thaw(line) >>> fit()
Thaw the nh parameter of the gal model and the abund parameter of the src model:
>>> thaw(gal.nh, src.abund)