Hi Federico, your understanding is correct. The problem is for 35 parameters. The 36th parameter is just a constant given the other 35.
I pass 36 parameter to the library and I am asking it to hold the 36th parameter fixed (by passing "upper bound" = "lower bound" = "guess 36th parameter guess value"). This should make the problem a 35 parameter problem to the library and it should not fail. So that is my confusion. Why is the library failing when I try to call the library this way. When I pass "n+m" parameters and fix "m" of the parameter should the library not try to optimize my function on the "n" parameter that it is allowed to move around? Best . On Fri, Feb 26, 2016 at 2:00 PM, federico vaggi <vaggi.feder...@gmail.com> wrote: > Unless I wildly misunderstood, doesn't your problem reduce to 35 > parameters? The 36th parameter is just a constant, given the other 35. > > On Fri, 26 Feb 2016 at 18:00 <nlopt-discuss-requ...@ab-initio.mit.edu> > wrote: > >> Send NLopt-discuss mailing list submissions to >> nlopt-discuss@ab-initio.mit.edu >> >> To subscribe or unsubscribe via the World Wide Web, visit >> http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/nlopt-discuss >> or, via email, send a message with subject or body 'help' to >> nlopt-discuss-requ...@ab-initio.mit.edu >> >> You can reach the person managing the list at >> nlopt-discuss-ow...@ab-initio.mit.edu >> >> When replying, please edit your Subject line so it is more specific >> than "Re: Contents of NLopt-discuss digest..." >> >> >> Today's Topics: >> >> 1. Fixing a parameter causing failure. (Kaushik Matia) >> >> >> ---------------------------------------------------------------------- >> >> Message: 1 >> Date: Thu, 25 Feb 2016 15:28:17 -0500 >> From: Kaushik Matia <kaushik.ma...@gmail.com> >> To: nlopt-discuss@ab-initio.mit.edu >> Subject: [NLopt-discuss] Fixing a parameter causing failure. >> Message-ID: >> < >> caoui8dxs+orltchiytxmtzyjmpnh_c2gp7c0ctpjgqbhqn0...@mail.gmail.com> >> Content-Type: text/plain; charset="utf-8" >> >> Hi, >> >> I have optimization problem with 36 parameters. I have a equality >> constraint where the last parameter is equal to the sum of the others i.e. >> x_36 =(x_1+...+x_35). >> >> I try to optimize as follows: >> >> 1) I set up problem with 36 parameters. >> 2) put lowerbound = upperbound =guess param for the 36th parameter with >> the >> intention to fix it from changing. >> 3) in my objective function valuation i just compute x_36 as given above >> and use it for function evaluation. >> >> When I try to use algorithm COBYLA or Isres I get a failure. >> >> The error happens inside static double elimdim_func() at the line >> >> val = d->f(); >> >> Essential the function pointer is null and the code breaks. >> >> May I please request someone to point out what I may be doing wrong >> >> Best >> -------------- next part -------------- >> An HTML attachment was scrubbed... >> URL: < >> http://ab-initio.mit.edu/pipermail/nlopt-discuss/attachments/20160225/8f4b7130/attachment-0001.html >> > >> >> ------------------------------ >> >> Subject: Digest Footer >> >> _______________________________________________ >> NLopt-discuss mailing list >> NLopt-discuss@ab-initio.mit.edu >> http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/nlopt-discuss >> >> >> ------------------------------ >> >> End of NLopt-discuss Digest, Vol 75, Issue 4 >> ******************************************** >> > > _______________________________________________ > NLopt-discuss mailing list > NLopt-discuss@ab-initio.mit.edu > http://ab-initio.mit.edu/cgi-bin/mailman/listinfo/nlopt-discuss > >
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