Jonathan Helgert
 Total activity 11
 Last activity
 Member since
 Following 0 users
 Followed by 0 users
 Votes 2
 Subscriptions 4
Activity overview
Latest activity by Jonathan Helgert
Jonathan Helgert created a post,
Stationary point for nonconvex QCQP?
AnsweredDear Gurobi team, I am working on a heuristic to solve a large nonconvex MIQCQP (1) that arises after discretizing a PDEconstrained optimal control problem. Fortunately, the problem can be transf...

Jonathan Helgert created a post,
Missing documentation for Model.getQ() method
AnsweredDear gurobi team, I noticed by accident there's a Model.getQ() method in the Python API. Unfortunately, there's no docstring and the method is not listed on the official docs. In [30]: ?m.getQSigna...

Jonathan Helgert created a post,
Barrier algorithm relatively slow for convex QCQP
AnsweredDear Gurobi team, I'm working on a heuristic to approximate the dual objective value for convex QCQPs. In order to benchmark my heuristic, I solved a few generated problems with Gurobi and Cplex as...

Jonathan Helgert commented,
Hi Jaromił, thanks a lot for the hint with the MESSAGE callback! For anyone who stumbles across this post, here's how it works (Python >= 3.8 required): def logIncumbents(model, where): # MIP solut...

Jonathan Helgert created a post,
How to distinguish between branchingsolutions and heuristicsolutions inside a MIP callback?
AnsweredDear Gurobi team, I have implemented a callback using the python API to log each new found MIP incumbent and the corresponding runtime: def logIncumbents(model, where): # MIP solution callback if...