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

Topic: Non-linear optimization
Replies: 32   Last Post: Mar 8, 2013 2:22 AM

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Matt J

Posts: 4,988
Registered: 11/28/09
Re: Non-linear optimization
Posted: Mar 6, 2013 4:55 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

"Bruno Luong" <b.luong@fogale.findmycountry> wrote in message <kh8bsc$bov$1@newscl01ah.mathworks.com>...
> "Matt J" wrote in message <kh89he$4al$1@newscl01ah.mathworks.com>...
>
> > f(x)=(sqrt(F(x)-f_low))^2
>
> What you write is
>
> f(x) = abs(F(x)-f_low) = F(x)-f_low
>
> Minimizing f(x) is the same as minimizing F(x). How far do we get?
===============

That should really have been

f(x)=sqrt(F(x)-f_low)

min (f(x))^2

But yes, the above is equivalent to minimizing F(x). That's what we want. Now, however, you can feed f(x) to LSQNONLIN and run its Levenberg-Marquardt routine.

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