Christian Perau

I am working with very large models that I solve iteratively changing some coefficients or RHS values between the iterations. Due to memory consumption I always need to construct and deconstrcut th...

Hello,  I recently integrated lazy constraints into my model. I just tried out some parametrization and especially the value for the Lazy attribute of the constraints I want to specify as such (in ...

I am working with rather big models. After the presolve (during the ordering) I notice the highest peak in memory usage. Due to this peak I often have to reduce the Threads parameter and therefore ...

Recently I encountered that (in some of my models) the variable values seem to be incorrectly stored into my data. When I try the following int i, error;double total_obj_by_hand=0, total_obj_by_gur...

After using the GRBfixmodel function my MILP is reported to be infeasible since the upper bound of some variables that are zero in the optimal solution is set to a (small) negative value instead of...

I am trying to solve a MILP using Bender's decomposition. Since there are many binary decision variables in the master, I need a lot of iterations. In the first iterations everything works just fin...

I want to implement the following objective function in the C-API: min (x²-1) + (y²-1) As far as I see it in the documentation I would need to reformulate the objective function to min x²-2x+1 + y²...

Since updating to gurobipy I receive an ValueError when I try to use addMConstr if I include constraint names. Here is a minimal reproducible example: import gurobipy as gpfrom gurobipy import GRBi...

Hi, I am trying to use CMake to use gurobi in C like described in https://support.gurobi.com/hc/en-us/articles/360039499751-How-do-I-use-CMake-to-build-Gurobi-C-C-projects-. However, when I try to ...

Hello, I am working with quite large linear models and finding myself with problems regarding memory usage. Building the model I observe a huge increase in memory consumption when I use model.addMV...