Problems with fmincon constraints

Hello,

I am writing an algorithm for a project of mine, and at some point I need to find the value of alpha that will minimize a function subject to constraints.

This is what I have

    x1=xi(1)+gammai(1)*alpha;
        x2=xi(2)+gammai(2)*alpha;
        x3=xd(1)+deltad(1)*alpha;
        x4=xd(2)+deltad(1)*alpha;

   falpha =matlabFunction((exp(x1))*(4*(x1).^2 + 2*(x2).^2 + 4*(x1)*(x2) + 2*(x2) + 1) + 0*x3 + 0*x4);
   c=matlabFunction([-10-x1; x1+9; -x2+1;x2-1.5;-x3;x3-1;-x4;x4-1]);
   ceq=matlabFunction([x1*x2-x1-x2+x3+1.5;x1*x2-x4+10]);
   const=[c, ceq];
   [alpha]=fmincon(falpha,0,[],[],[],[],[],[],const);

This is the error I get: Error using horzcat Nonscalar arrays of function handles are not allowed; use cell arrays instead.

Answer 1

[Walter Roberson]

const = @(alpha) deal(c(alpha), ceq(alpha));

[Edgard El Cham]

Thank you, it worked!

Answer 2

[Matt J]

As the error says, your const argument must be a single function handle returning two arguments [c,ceq]. You instead have passed two separate function handles.

[Edgard El Cham]

How can I fix const so that the fmincon works? I do not want you to solve it for me, maybe give me an example, if possible. Thanks

[Matt J]

 function [c,ceq]=myConstraints(alpha)

 ....

[Edgard El Cham]

Thing is I need to run it in a loop, with changing constraints.

[Matt J]

That can be done by passing fixed parameters to the constraints.