How to use more than one variable as an input for a NonLinear Constraint function with FMINCON

Hello,

I have an optimization problem where the number of constraints are subjected to the length of one variable. I'm writing the constraints with the OR instead of AND constraints, as I need to define several lower and upper bounds. When I explicitly write the constraint function for one single case, the optimization works very well:

function [c,ceq] = ConstraintsOR1 (x)
ceq=[abs(x(2)-x(1))-0.85];
Fx1(1)=minDist1(x(1),0.20,0.55);
Fx1(2)=minDist1(x(1),0.95,1.42);
Fx1(3)=minDist1(x(1),1.78,2.30);
c(1)=min(Fx1);
Fx2(1)=minDist1(x(2),0.20,0.55);
Fx2(2)=minDist1(x(2),0.95,1.42);
Fx2(3)=minDist1(x(2),1.78,2.30);
c(2)=min(Fx2);

But if instead of typing all the values I want to call another variable like this:

function [c,ceq] = ConstraintsOR1 (x,e,t)
ceq=[abs(x(2)-x(1))-e]; 
u=1:2:length(t);
for i = u
  Fx1(i)= minDist1(x(1), t(i), t(i+1));
  Fx2(i)= minDist1(x(2), t(i), t(i+1));
end
Fx1=Fx1(u); Fx2=Fx2(u);
c(1)=min(Fx1);
c(2)=min(Fx2);

The fmincon does not run as I'm adding two extra input variables to the constraint function. I don't know how to call these variables without explicitly call them, I also try to add them into the minDist1 function that I used inside the constraint function, but it doesn't work neither.

Any help or suggestion will be very much appreciated. Thank you in advance,

Martha

Answer 1

[Torsten]

Pass your constraint function as

x = fmincon(fun,x0,A,b,Aeq,beq,lb,ub,@(x)ConstraintsOR1(x,e,t),options)

to fmincon.

Best wishes

Torsten.

[Martha]

Thank you Torsten, quite clean and simple solution. It worked very well!