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Re: Optimization "AMOEBA" [message #68034 is a reply to message #68031]

Wed, 23 September 2009 00:54

Wout De Nolf
Messages: 194
Registered: October 2008

Senior Member

On Tue, 22 Sep 2009 16:30:45 -0700 (PDT), Nicki
<nickireiter87@yahoo.de> wrote:

>
>
>> Set a breakpoint in your FUNC and check for NaN's. For example:
>> "a=NaN" when P=[0.5,30].
>
> But still... If I set my scale to let's say [0.5, 0.5] for [0.55, 60.]
> it should definitely work. however i get -0.2000 for P[0] which is not
> even in the set range for P[0] (it goes from 0.05 to 1 (see above))
> However I have no idea why... Somebody can help me out?

FUNC will still return NaN at some point! Add the following line to
FUNC to check it yourself:

FUNCTION FUNC, P
...
if ~finite(s) then stop
RETURN, -S
END

I see what your problem is now. The P0 and SCALE define an initial
simplex and by no means constraint the space in which the minimum
should lay. See: http://www.nrbook.com/a/bookcpdf/c10-4.pdf

Maybe you can do something like this when P gets out of its range:

FUNCTION FUNC, P
...
if ~finite(s) then return,!values.F_INFINITY
RETURN, -S
END

Does that work?

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[Message index]

		Re: Optimization "AMOEBA" By: Nicki on Thu, 24 September 2009 06:23
		Re: Optimization "AMOEBA" By: Wout De Nolf on Thu, 24 September 2009 01:13
		Re: Optimization "AMOEBA" By: Wout De Nolf on Thu, 24 September 2009 00:56
		Re: Optimization "AMOEBA" By: Wout De Nolf on Thu, 24 September 2009 00:37
		Re: Optimization "AMOEBA" By: Nicki on Wed, 23 September 2009 19:13
		Re: Optimization "AMOEBA" By: Nicki on Wed, 23 September 2009 18:04
		Re: Optimization "AMOEBA" By: Wout De Nolf on Wed, 23 September 2009 06:41
		Re: Optimization "AMOEBA" By: Jeremy Bailin on Wed, 23 September 2009 04:49
		Re: Optimization "AMOEBA" By: Wout De Nolf on Wed, 23 September 2009 00:54
		Re: Optimization "AMOEBA" By: Nicki on Tue, 22 September 2009 16:30
		Re: Optimization "AMOEBA" By: Wout De Nolf on Mon, 21 September 2009 00:38
		Re: Optimization "AMOEBA" By: Nicki on Fri, 18 September 2009 06:05
		Re: Optimization "AMOEBA" By: Wout De Nolf on Fri, 18 September 2009 04:52
		Re: Optimization "AMOEBA" By: Wout De Nolf on Fri, 18 September 2009 04:45
		Re: Optimization "AMOEBA" By: Wout De Nolf on Thu, 24 September 2009 07:13
		Re: Optimization "AMOEBA" By: Nicki on Wed, 07 October 2009 16:15

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