I solved a large scale supply chain problem using MATLAB R 2015b. The number of variables are around 2000. I used two solvers 'linprog' and 'intlinprog' for comparing the two solver's results. I used the same data and same mathematical formulation for the two solvers.I got the result (cost) using linprog solver as 8.9643E4 and the cost using intlinprog as 0 (zero).I also modelled the same model in GAMS also. I used CPLEX and LINDO solvers. I got the results for GAMS using CPLEX and LINDO solvers as 1.334834E8 and 1.365910E8 respectively. I want to know why is intlirog solver produced so small cost (0) zero.