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 Tristan,
Thank you very much for a comprehensive answer and possible solutions.
I have looked into rounding when preparing the problem, however I cannot find any number that causes this error directly.
I agree that changing the FeasTol to 10^-4, which indeed is perfectly fine for our model, the QCQP solver finds a solution. That is really good, and is the solution I will go with!
However, if the issue is that the original model with integralities is too complex and a bit more wiggle-room is allowed, I guess there must be a tolerance/precision setting to control this wiggle-room?
Also, even when using the lp-file created using WriteProb (which should then have full precision?) the IIS still finds the model feasible. What am I missing here?
Cheers,
Jonas