[Octave-bug-tracker] [bug #60018] [octave forge] (optim) residmin_stat gives error when some variables are flagged as fixed.

[Markus Mützel]

Follow-up Comment #2, bug #60018 (project octave):

This seems to be a regression from optim 1.5.3 to optim 1.6.0 (not a
regression in core Octave).

The respective lines in `__resid_min__` are:
https://sourceforge.net/p/octave/optim/ci/default/tree/inst/private/__residmin_stat__.m#l369

    ## model function
    f = @ (p, varargin) f (assign (pfin, o.nonfixed, p), varargin{:});

    ## jacobian of model function
    if (have_dfdp)
      f.dfdp = @ (p, hook) ...
          f.dfdp (assign (orig_p, o.nonfixed, p), hook)(:, o.nonfixed);
    endif


The function handle `f` cannot be indexed with `.`.

Possibly introduced with this changeset:
https://sourceforge.net/p/octave/optim/ci/f35fa39838a1#diff-4

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