MATLAB: MILP-error with constraints

milp

First approach with MILP and intlinprog in R2015a.

I keep having the same error. Here it is an example:

intcon=2;
f=[100;70];
Aeq = [1,1];
beq = 1;
lb = zeros(2,1);
ub = lb+1;
x = intlinprog(f,intcon,Aeq,beq,lb,ub)

The error given is:

Error using intlinprog (line 121)
The number of columns in Aeq must be the same as the number of elements of f.
Error in patient2milp (line 26)
x = intlinprog(f,intcon,Aeq,beq,lb,ub)

What should I change?

Thank you and sorry if it is a silly question!

Best Answer

x = intlinprog(f,intcon,[],[],Aeq,beq,lb,ub);

Best wishes

Torsten.

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It's a case sensitivity issue. Instead of 'LB' and 'UB', pass in 'lb' and 'ub'.

MATLAB: Production Optimization using MILP

Thank you Alan. I figured it out myself today. The problem was to implement the I(t-1,k) to the linear equality condition. I wanted to have the condition

 I(t-1,k) + Q(t,k) - I(t,k) = d(t,k)

Which will set the previous stock I(t-1,k) plus the amount of units produced in this period Q(t,k) minus the left amount of units, which will be stored, equal to the demand of the current period d(t,k) I solved the problem:

 % Demand is satisfied
for ii = 1:T
    for jj = 1:K
        xtemp = clearer2;
        xtemp(ii,jj) = -1; % Every I(t,k) * -1
        xtemp2 = clearer3;
        xtemp2(ii,jj) = 1; % Every Q(t,k)
        if(ii > 1) 
            xtemp(ii - 1,jj) = 1; % Every I(t-1,k)
        else
            xtemp(1,jj) = -1; % First period there is no I(t-1,k)
        end
        xtemp = sparse([clearer12;xtemp(:);xtemp2(:)]'); % Change to sparse row
        Aeq(counter,:) = xtemp'; % Fill in 
        beq(counter) = d(ii,jj); 
        counter = counter + 1;
    end
end

Best Answer

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