Hi
As per your code, the equality constraints are working fine with different[MT1] values of ub, b, price. To get a deeper understanding, refer this documentation of linprog . So basically, the code is minimizing price'*x such that A.x <= b and lb <= x <= ub. The 'random' value 2 is always associated with the index where priceis largest because we are trying to minimize price'*x and the argument passed in linprog is -price.
Another thing you can do to verify the correctness of the function, is by trying to set ub = 1.2 or by increasing b. You'll see non-zero values in index corresponding to next price value.
Hope this helps.
