First of all, I am really new to this GAMS tool and I am using it as an input in my MNL model in python, so it clearly is not my field -- I apologize in advance because my doubts will probably be very simple.
So, I am currently trying to perform a non-linear programming problem that looks like this: My current code is the following:
I am not even at the running the model phase... I get lots of errors, specially at the cons1 line...
Code: Select all
$sTitle Set Definitions Set i 'SKU in analysis' j 'Complementary SKU'; $sTitle Model Parameters Parameter d(j) stockout probability of each SKU $ondelim $include C:\Users\ricardo.cabral\Documents\Project\data.csv $offdelim; Parameter s(i) demand rate for each SKU $ondelim $include C:\Users\ricardo.cabral\Documents\Project\demand_rate.csv $offdelim; $sTitle Model Definition Variable a(i,j) 'the substitution rates between i and j' l(i) 'the intrinsic demand rate for that SKU' er 'the error of the equation'; Positive Variable a(i,j),l(i); Free variable z, er; Equation cons1 cons2 obj; cons1.. s(i) = er + l(i) + sum((i,j) $ i ne j, a(i,j)*l(j)*d(j)); cons2.. sum((i,j), a(i,j) = le= 1; 'obj.. z =e= cons1**2 ;
Can someone help me please? Been stuck for a couple days