Robert Luce

Hello Victor,   thanks for letting us know!  Unfortunately the only linear transformations that we currently support are one-sided, and only for 1-D MVar objects, viz., A @ x. I have logged your ex...

The syntax you are using is very reasonable, but unfortunately the expression y*y, which I would interpret as a quadratic expression of shape (5,), is not yet supported by gurobipy (all quadratic e...

Hello Sven, in the next bugfix release 9.0.1 (due in the next few weeks or so), you'll be able to query relaxation and solution values on MVar objects in the callback. The result of such a query is...

Paulo, I looked at the new data, and indeed the regularization determined by Gurobi's PSD test is far off from just a small diagonal shift.  Unfortunately we run here into the limits of what our fa...

The non-PSD error is due to a bug in gurobipy: If an arithmetic operation with an MQuadExpr object results in an FP underflow, the data underlying the MQuadExpr object may become corrupted.  In you...

Probably unrelated, but noteworthy nevertheless:  Your matrix K contains a lot of very tiny values, e.g., >>> print(K)[[ 1.00000000e+000 2.00249261e-135 -0.00000000e+000 ... 6.96007338e-032-5.59563...

Thanks for reporting, I will investigate!   Robert

I wonder about one detail in your message though:  In your callback you do v = m.cbGetNodeRel([m._visitors]) vv = v.getAttr('x') where m._visitors is an MVar object, so my expectation would ...

Hello Sven, our first step towards a matrix friendly API for gurobipy indeed lacks such operations like pointwise multiplication with MVar objects, but I have taken note of this feature request.  A...

Infinite or NaN coefficients in linear constraints are disallowed, and we do not support them in file formats like LP, or MPS.  Most often the presence of such coefficients point at an error during...