Dear Sir, Thanks for the reply I regret for the vagueness perhaps I should have approached in more detailed. However, the program in the link which you have shared works very well with the gradient based methods which I have been using it for most of my applications. But lately I wanted to try the Global optimization algorithms i.e.derivative free method, so I dont understand what changes should be made to use derivative free algorithm if I try to use the same example code which is there in the link. When I try to solve the same example by just changing in "opt = nlopt_create(NLOPT_LD_MMA, 2); /* algorithm and dimensionality */" to "NLOPT_GN_ISRES" and giving the grad calculation to NULL it compiled well, but while running i got the error "nlopt failed!". Hence I knew I am missing something in the code but not exactly understanding what changes should be made.
Thanks & Regards On Fri, Aug 22, 2014 at 7:07 PM, Smith, Dale (Norcross) < [email protected]> wrote: > Sorry, but your question is simply too vague to answer. There are many > global algorithms supported by nlopt. Which one(s) did you try? What do you > mean by “invalid”? > > > > Perhaps you need to read the wiki, which was what I used to get started. > Can you implement a program which solves the problem on the tutorial page > and get the same result? Try different algorithms with it as well. > > > > http://ab-initio.mit.edu/wiki/index.php/NLopt_Tutorial > > > > The Algorithms page is also very useful. > > > > *Dale Smith, Ph.D.* > > Senior Financial Quantitative Analyst > > Financial & Risk Management Solutions > > Fiserv > > Office: 678-375-5315 > > www.fiserv.com > > > > *From:* NLopt-discuss [mailto:[email protected]] *On > Behalf Of *milind d > *Sent:* Thursday, August 21, 2014 5:48 PM > *To:* [email protected] > *Subject:* [NLopt-discuss] Search methods > > > > Hi, > > > > I wanted to ask if someone has a small sample or tutorial example which > uses Global optimization algorithm. It would be very helpful as I am trying > to use it but it keeps saying invalid. I just want an easy sample program > as in the documentation of the NLOPT site there is only example which uses > derivatives. It would be very helpful if anyone could share the sample > program. > > > > Thanks > > > > -- > Milind Dhake > > Engineering Mechanics Unit > > Jawaharlal Nehru Centre for Advanced Scientific Research > > Bangalore > -- Milind Dhake Engineering Mechanics Unit Jawaharlal Nehru Centre for Advanced Scientific Research Bangalore
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