Ryuta Tamura

I got more specific example:\[\begin{align} \min -x -y  \\ \text{s.t. } y &\leq 0.9  \\ y - ax &\geq 0 \\  x,y &\geq 0\end{align}\]where x and y are interger. For this problem, the only integer sol...

Hi Nick,If I understand correctly, you don't want to use the information available from the LP solution to provide constraints for MIP, you want to know whether such a relationship equation between...

Hi NickDo you want to do the following? Assume \(x^{'}\) is a relaxation solution of \(x\) \(x^{*}\) is a optimal solution of \(x\) Then,  \(x^{'} - d \leq x^{*} \leq x^{'} + d\) If so,  you can so...

Hi Xintong Zhou,Gurobi 12.0.2 was recently released and I am consistently getting a result of “772.64..” on my machine(win/Linux) with ver. 12.0.1/12.0.2 using your parameters with 10000 seeds. The...

Thank you for sharing your logs! I will take a look.

Hi Xintong Zhou,Could you also provide a Gurobi Log showing this situation?Thanks,Ryuta

Hi Ethan, As you saw in the error, Gurobi accepts a linear or quadratic function as the objective function. NLExpr is only available for constraints. However, you can use auxiliary variables to set...

Any easy way to debug it? For example, you can do it by fixing ub and lb of all variables to their values and then use computeIIS to see which parts are violated.  This article might be helpful. ...

Hi,"var.X" attribute cannot be referenced directly in the callback. In your code, the return value of GetNodeRel, “x”, seems to have the values of the node solution. Please check the value of the v...

Hi,  But I still do not understand, why gurobi does not accept the complete solution? Have you checked the return value of cbUseSolution?  If the given solution is not accepted, the value will be...