If loadings \(\ell_{\cdot k}\) or factors \(f_{\cdot k}\) for one or
more factor/loadings pairs have been "fixed" using function
flash_factors_fix, then they can be unfixed using
function flash_factors_unfix.
flash_factors_unfix(flash, kset)A flash or flash_fit object.
A vector of integers indexing the factor/loadings pairs whose values are to be unfixed.
The flash object from argument flash, with
values for the factor/loadings pairs specified by kset unfixed.