[Octave-bug-tracker] [bug #57199] [octave-forge] (optim) lsqnonlin in version 1.6.0 fails with Octave 6.0

[Nir Krakauer]

Follow-up Comment #7, bug #57199 (project octave):

The lsqnonlin error in Dev Octave is due to Octave becoming more restrictive
in parsing anonymous functions (cf. bug #57255 and bug #57392).

One way to fix it is to wrap the anonymous function code in eval to do the
parsing. This entails replacing lines 119-131 of __jacobian_constants__.m 
with


eval (['f.(fname) = @ (p, varargin) f.' fname ' (p, varargin{1:end-1},
cell2fields ({v_opts{:}, o.plabels, assign(o.jac_fixed, o.nonfixed,
varargin{end}.fixed), o.cstep, o.parallel_local,  o.parallel_net, true},
{names_j{:}, "plabels", "fixed", "h", "parallel_local", "parallel_net",
"__check_first_call__"}, 2, varargin{end}));'])


This lets the example and tests run correctly. I don't know if there's a
better way.

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