looking for a solution for an optimization problem
1 view (last 30 days)
Show older comments
hi, I am looking for a solution for an optimization problem,
I have a set of non-linear equations and I am looking for positive results, what is the method to follow? an example if possible.
thanks a lot
0 Comments
Accepted Answer
Alan Weiss
on 5 Feb 2020
You might find this example relevant. If you have a recent MATLAB version, then look at this example.
Alan Weiss
MATLAB mathematical toolbox documentation
4 Comments
More Answers (3)
Alan Weiss
on 6 Feb 2020
I think that you need to be more careful when trying to follow the example. EITHER use fmincon OR use lsqnonlin, not both. The fmincon workflow:
fun = @(x)0;
The nonlinear constraint function is nlcon at the end of this example.
Set lower bounds of zero.
lb = zeros(3,1);
Run fmincon starting from [0.1;0.1;0.1];
x0 = 0.1*ones(3,1);
[x,fval,eflag] = fmincon(fun,x0,[],[],[],[],lb,[],@nlcon)
This finds the solution you want.
Alan Weiss
MATLAB mathematical toolbox documentation
function [c,ceq] = nlcon(x)
c = [];
ceq = [x(1)^2 - 1;
x(2)^2 - 4;
x(3)^2 - 9];
end
0 Comments
Zinedine Gueddal
on 8 Feb 2020
1 Comment
Alan Weiss
on 9 Feb 2020
I'm sorry, but I do not understand what you are asking. Are you saying that different input data yields different results, and some of those results are not satisfactory? Or are you saying that you tried running another program and it gave better results? Or are you asking something else?
Alan Weiss
MATLAB mathematical toolbox documentation
See Also
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!