I used MC15M030 to solving an optimitization problem, and I defined ALL >= 0, all the variable large or equal to zero.
I have used 4 methods to do it in a same Maximize Solveblock, but I have got 3 different result.
Look at the pictures below:
the result of (1) and (2) are same and right.
(3) and (4) are different and wrong.
How to explain this puzzle?