MATLAB: The number of rows in A must be the same as the number of elements of b.

linprog

%% Discrete modelling 
Ae=(1-(K*ts)/Cth);
Be=(ts*COP*HP)/Cth;
D=ts*K/Cth;
Tin=zeros(1,i);
u=zeros(1,i);
for j=1:i
    
%     f=@(u) sum(u(j)*gamma(j));
      f=u(j); 
    %%%Starting point%%%
    u0=0;
    if j>1
        Tin(j+1)=Ae*Tin(j)+Be*u(j)+D*Tout(j);
    else
        Tin(j)=0;
    end
    %%%Constraints%%%
    %%%Equality%%%%
    Aeq=Be;
    beq=(Tin(j+1)-Ae*Tin(j)-D*Tout(j));
    
    %%%Inequality%%%
    A=[(Tin(j)*Be)/(Tin(j+1)-Ae*Tin(j)-D*Tout(j)) ;(-(Tin(j)*Be)/(Tin(j+1)-Ae*Tin(j)-D*Tout(j)))];
    b=[Tmax ; -Tmin];
    
    options = optimoptions(@linprog,'Display', 'off');
    
    u(j)=linprog(f,u0,A,b,Aeq,beq,umin,umax,options);
end
I am getting the error: The number of rows in A must be the same as the number of elements of b.
Does anyone know why?
Thanks!

Best Answer

MATLAB function calls use positional parameters, not named parameters. The second parameter you are passing, u0, is getting received in the slot where the linear constraints matrix is expected, so you are setting your constraints matrix to scalar 0. Your variable named A is being received in the linear constraints outcome vector, and has two elements, which is not the same as the number of rows of your scalar u0.
Your u0 parameter should not be present.
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