I'm using 'quadprog' in Simulink, but the 'boundary constraint' is invalid

I'm using 'quadprog' in Simulink, but the 'boundary constraint' is invalid.

The output does not report error, but the output result exceeds the Ub I set, the maximum value exceeds 200.

This is part of my code, kesai is a 5*1 vector，I'm sure the dimension of the matrix is correct

H = 2*W + 2*yita*M'*Ww*M;
%% 
f = -2*yita*M'*Ww*V;
A = [];
b=[];
Aeq = M;
beq = V;
lb = [-100,-100,-100,-100,-0.02];
ub = [200,200,200,200,0.02];                                                                        
x0 = [0,0,0,0,0];                                                               
options = optimoptions('quadprog','Algorithm','active-set');
[kesai] = quadprog(H, f, A, b, Aeq, beq, lb, ub, x0, options);

[Torsten]

And how should we be able to help with this information ?

Maybe switch the options ? Or use fmincon ?

[任飞]

Thank you, I will try to use fmincon.

[任飞]

I was wondering if there could be a conflict with the given constraint, causing the constraint to fail. If there is a conflict between constraints, will MATLAB report an error?

[Jon]

Please provide (attach files as needed) a simple, stand alone, runnable example that will reproduce the problem.

[Torsten]

I was wondering if there could be a conflict with the given constraint, causing the constraint to fail. If there is a conflict between constraints, will MATLAB report an error?

You should look at the exitflag from quadprog:

[x,fval,exitflag,output] = quadprog(___)

If exitflag = -2, e.g., the problem is classified as infeasible.

Answer 1

[Swaraj]

Hi,

You can try out the following to debug your issue furthur.

You can use “quadprog” function which outputs the “exitflag” as one of its outputs.

[x,fval,exitflag,output] = quadprog(___)

Once you have the “exitflag” value, you can use the following table to find the exact issue.

For more details, you can go through the following documentation.

Quadratic programming - MATLAB quadprog (mathworks.com)

In order to investigate accurately and precisely, can you please give a standalone piece of code that will reproduce the issue.

Hope it helps!!

[任飞]

The ‘exitflag’ is -2 in nearly 50% of my simulation time.

Does this mean that there is no optimal solution for the quation constraints and boundary constraints？