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Thread Subject: nonlinear constraint optimization GAOT

Subject: nonlinear constraint optimization GAOT

From: OK1

Date: 29 Apr, 2008 16:46:02

Message: 1 of 2

Hi Everyone,
can anyone help me to solve nonlinear constrained problem
in GA toolbox. I've solved many unconstrained problems and
I didn't face any trouble at all but when I tried to solve
some nonlinear constrained problems I found it difficult.
I had wrote an M-file for the fitness function then
another one for the constraint([c,ceq]=...)and run
gatoolbox with all the rest options but all of the results
were in infeasible region. I'm new to MATLAB so I did
every solution using gatoolbox help (that is the
possibility of my failure). But only thing that I found
about nonlinear constrained problems is that i should use
nonlinear constrained solver that uses the Augmented
Lagrangian Genetic Algorithm(ALGA).Where the subproblem is
formulated by combining the fitness function and nonlinear
constraint function using the Lagrangian and the penalty
parameters.
Can anyone provide a more detailed description of this
solver to me or what would be realy great some examples
solved by this solver(including M-filies) so that i can
learn how to solve such problems and use it for my
problems. Many thanx

Subject: Re: nonlinear constraint optimization GAOT

From: Marcus M. Edvall

Date: 05 May, 2008 22:56:03

Message: 2 of 2

Can you send me the code to take a look at? GA are usually quite slow
and limited. Better to look at a global solver such as glcCluster,
OQNLP or LGO.

Best wishes, Marcus
Tomlab Optimization Inc.
http://tomopt.com/

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