At any time after a mixed integer program has been created by a call to CPXcreateprob, the routine CPXmipopt may be used to find a solution to that problem.

An LP solution does not exist at the end of CPXmipopt. To obtain post-solution information for the LP subproblem associated with the integer solution, use the routine CPXchgprobtype.

Example

 status = CPXmipopt (env, lp);
 

See also the example mipex1.c in the standard distribution.

Examples of errors include exhausting available memory (CPXERR_NO_MEMORY) or encountering invalid data in the CPLEX problem object (CPXERR_NO_PROBLEM).

Another possible error is the inability to solve a subproblem satisfactorily, as reported by CPXERR_SUBPROB_SOLVE. The solution status of the subproblem optimization can be obtained with the routine CPXgetsubstat.

Exceeding a user-specified CPLEX limit is not considered an error. Proving the problem infeasible or unbounded is not considered an error.

Note that a zero return value does not necessarily mean that a solution exists. Use the query routines CPXsolninfo, CPXgetstat, CPXsolution and the special mixed integer solution routines to obtain further information about the status of the optimization.