Synopsis
Allow model parameters to be varied during a fit.
Syntax
thaw(*args)
Description
If called with no arguments, then all parameters of models in source expressions are thawed. The arguments can be parameters or models (in which case all parameters of the model are thawed).
Examples
Example 1
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()
Example 2
Thaw all parameters of the line model and then re-fit:
>>> thaw(line) >>> fit()
Example 3
Thaw the nh parameter of the gal model and the abund parameter of the src model:
>>> thaw(gal.nh, src.abund)
Notes
The `freeze` function can be used to reverse this setting, so that parameters are "frozen" and so remain constant during a fit.
Bugs
See the bugs pages on the Sherpa website for an up-to-date listing of known bugs.