Eventually I did just that but I am curious to understand why it should fail if I pass a parameter as fixed. On Feb 26, 2016 4:27 PM, "federico vaggi" <vaggi.feder...@gmail.com> wrote:
> I understand. But why don't you just pass 35 parameters to the library > instead of passing 35 + a 'fixed' parameter? > > On Fri, 26 Feb 2016 at 21:55 Kaushik Matia <kaushik.ma...@gmail.com> > wrote: > >> 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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