Originally posted by: Itherain

Hi

I have used cplex to solve a MIP problem.

But, the routine CPXgetstat() returns zero.  However, I do not know the meaning of this return value. Any help would be appreciated.

The documentation for CPXgetstat is here.  Here's the pertinent sentence from that page: "A return value of 0 (zero) specifies either an error condition or that a change to the most recently optimized problem may have invalidated the solution status."

This may not be very useful ... you may have to provide more details.

Originally posted by: Itherain

Thank you.

CPXgetstat() returns 0, CPXmipopt() returns 1001, and CPXgetmipobjval() returns 1217.  I do not why this happens.

I used CPXwriteprob() to write the  subproblem when CPXgetstat() returns 0 and found the subproblem is integer infeasible.