title: What is primal infeasible solution in GAMS?
body: <p>I am using GAMS for solving a MILP problem which includes binary variables. However there is a problem in the solution. Surprisingly, I have seen that one of the binary variables in the solution has a found value of "-1" another one "2". That is not acceptable. I do not know what happened. GAMS gives me the message <code>primal infeasible</code>.</p>