# Problem finding maximum of a nonlinear problem

1 visualizzazione (ultimi 30 giorni)
Jaime De La Mota Sanchis il 15 Lug 2022
Modificato: Torsten il 15 Lug 2022
I have the following problem.
Minimize subject to and
I am trying to use fmincon to find this point.
My attempt as solutuion is as follows:
close all
clear
clc
fun = @(x) x(1)+x(2)+x(3); %minimize
lb = [];
ub=[];
x0 = [1 1 1];
A = [];
b=[];
Aeq=[];
beq=[];
x = fmincon(fun,x0,A,b, Aeq, beq, lb, ub, @constraints)
Local minimum found that satisfies the constraints. Optimization completed because the objective function is non-decreasing in feasible directions, to within the value of the optimality tolerance, and constraints are satisfied to within the value of the constraint tolerance.
x = 1×3
-1.4142 0.2929 -0.7071
function [c,ceq] = constraints(x)
c=[0 0];
c(1) = (x(2)-1).^2+x(3).^2-1; % <=0
c(2) = x(1).^2+(x(2)-1).^2+x(3).^2-3;
ceq = [];
end
Unfortunately, this does not work, since I get as a result
x =
1.0e+52 *
-8.2469 -0.0000 -0.0000
I know that the solution should be but I cannot see what I am doing wrong. Can someone please help me?
Best regards.
##### 3 CommentiMostra 1 commento meno recenteNascondi 1 commento meno recente
Jaime De La Mota Sanchis il 15 Lug 2022
@Torsten So, are you telling me that all the problem is that I had a typho on the statement of my problem? Anyway, thanks for the help.
Torsten il 15 Lug 2022
Modificato: Torsten il 15 Lug 2022
Yes, x^3 produces negative values if x is negative. This makes your problem unbounded.

Accedi per commentare.

### Categorie

Scopri di più su Introduction to Installation and Licensing in Help Center e File Exchange

R2021a

### Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by