[Help-glpk] Re: Status : Integer Undefined : what does it mean.

[Andrew Makhorin]

> I am trying to solve a problem with GLPK 4. 36.  As I run it with
> GPLSol with timeout of 900 seconds, it prints out the line "OPTIMAL
> SOLUTION FOUND" after some time in the log file and then "Integer
> Optimization Begins"

The message "OPTIMAL SOLUTION FOUND" means that the solver found an
optimal solution to LP relaxation, not to MIP.

> After time out when the output file is generated. It shows 
> "Status: INTEGER UNDEFINED"

> What is the meaning of this ?

This means that the solver did not find any integer feasible solution
for 900 secs.

>  Should I consider that it is able to solve my prolbem ?

Try to increase the time limit.