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Math Forum » Discussions » Software » comp.soft-sys.matlab

Topic: fminunc gradient question
Replies: 1   Last Post: Oct 17, 2005 5:00 PM

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Marcelo Marazzi

Posts: 24
Registered: 8/29/05
Re: fminunc gradient question
Posted: Oct 17, 2005 5:00 PM
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What version of MATLAB are you using? Can you set the options
Display to 'iter' (via optimset) and paste the output?

-marcelo

m!ke wrote:
> I have an optimization problem with about 19 dimensions. For some
> reason, using the medium-scale algorithm and fminunc, it does not
> calculate a gradient at even the first iteration and declares that
> there was no change in gradient as it bails. When I look at my
> parameter file, it is clear that no finite-difference gradient calcs
> have been made since the parameter file remains unchanged. However,
> when I run it with a two-dimension version it works fine.
>
> Any suggestions on why the gradient might not be calcualted are mich
> appreciated!
>
> peace,
> m!ke




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