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Topic: nonlinear optimization problem with constraints
Replies: 7   Last Post: Sep 14, 2012 5:13 AM

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Gordon Sande

Posts: 137
Registered: 5/13/10
Re: nonlinear optimization problem with constraints
Posted: Sep 8, 2012 9:35 AM
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On 2012-09-08 05:50:07 -0300, oercim said:

> Hello.I have an nonlinear optimization problem with constraints. I
> realy need help. I am using a package problem to solve this problem.
> However, although the program finds a solution without an error( since
> tolarance values are satisfied), when I check the constraints values ,
> O see that some constraint values are not satisfactory (some
> constraints are realy close to zero which is satisfactory, but some are
> not close enough to zero).
> There are 5 unknowns and 4 constraints. So this system has infinitly
> many solutions. I just want which solution makes the objevtive function
> minimum.
> I don't have a much optmization background. I just want to determine
> among solutions(where the constraints are close enough to zero) which
> one makes the objective function minimum. As I mentioned, my priority
> is constraints to be satisfied satisfactorily.
> I don't know how to searh this subject. I studied some nonlinear
> optmization resources. However all terminates when the tolareance
> values are close to zero not each of the constraints close to zero. Is
> there a way to control the closenes of the constraint to zero. If there
> is a way, I will be very glad for recomendaton of some resources. At
> least if this subject has an special name in the literature, I want to
> leaarn it.Thanks a lot. Best regards.

Have you consulted the Guide to Optimization Software at

The statements that some constraints are close to zero and others are
not satisfactory does
not sound like you have a clear idea of what constraints are supposed
to do. Are they exact
conditions - always zero? Are they boundaries - so closeness does not
matter? Etc? Is your
objective being used to judge the closeness to the constraints or is it
of the constraints?

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