Minimising anonymous/inline function

[J Heeris]

Say I have a struct that contains a function:

item = struct('x', 1, 'y', 2, 'f', @sin);

How do I minimise item.f? I can't use the octave-forge minimize, because the
leval function in the optimisation package expects a string, but then when
it calls feval, it needs the function handle.

> minimize(params.f, 0)
error: octave_base_value::convert_to_str_internal (): wrong type argument
`function handle'
error: leval: first argument must be a string
error: leval: second argument must be a list
error: feval: the symbol `' is not valid as a function
error: evaluating assignment expression near line 153, column 8
error: evaluating for command near line 152, column 1
error: called from `nelder_mead_min' in file
`/usr/share/octave/packages/optim-1.0.3/nelder_mead_min.m'
error: evaluating if command near line 276, column 3
error: evaluating if command near line 275, column 1
error: called from `minimize' in file
`/usr/share/octave/packages/optim-1.0.3/minimize.m'


> minimize("params.f", 0)
error: feval: the symbol `params.f' is not valid as a function
error: evaluating assignment expression near line 153, column 8
error: evaluating for command near line 152, column 1
error: called from `nelder_mead_min' in file
`/usr/share/octave/packages/optim-1.0.3/nelder_mead_min.m'
error: evaluating if command near line 276, column 3
error: evaluating if command near line 275, column 1
error: called from `minimize' in file
`/usr/share/octave/packages/optim-1.0.3/minimize.m'

At the moment I'm going to go through my code, extract all the computations
and define a separate function file that can take the necessary parameters.
So I guess my real question is: is there an easier way than that?

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