Forum Discussion
QCQP model doomed infeasible in presolve, however it is not
Hi, I am trying to solve a QCQP model, which is doomed infeasible by the pre-solver. However, when solving with presolve deactivated it solves fine - just takes a very long time! Calling the IIS doe...
Hi Jonas,
how did you create that .lp file, as I am struggling to reproduce the infeasibility? It seems like the .lp-file includes 362381 rows while your log shows 360816 rows. Also an mps file might be better to ensure that the column ordering is kept intact.
Otherwise the presolve seems to point to row AVVAVV2Mode6AFRRVerticalUpCondensing2_23, although of course we may have already made changes to the row at this point, but still it might point to issues with the variables in that row. Also it might be worth trying to adjust the feasibility and matrix tolerances and see if that can help, as the solutions I am getting with barrier tend to have some slight infeasibilities where there can be differences between presolve and the LP solvers themselves.
Best,
Tristan