Matheus Ota
- Total activity 14
- Last activity
- Member since
- Following 0 users
- Followed by 0 users
- Votes 0
- Subscriptions 4
Activity overview
Latest activity by Matheus Ota-
Matheus Ota commented,
Hi Marika,In that particular instance, if the return happens before the check, the code crashes later during cut separation. But in most crashing instances, GDB was pointing out that the code was c...
-
Matheus Ota commented,
I had the same error again. Here is the new callback code. Just to be clear, I believe the checking loop do not use any Gurobi data. The separation routine does, but it is called after all the chec...
-
Matheus Ota commented,
Hi Marika,It is not a single cut that triggers the issue. Only after Gurobi is running for a while that the issue happens (so multiple cuts get added and of different types). It is hard to isolate ...
-
Matheus Ota created a post,
Suggestions for debugging double free error?
AnsweredHi,I've implemented a branch-and-cut algorithm in C++ with Gurobi that adds several families of cuts. In some instances, whenever I add one of these families of cuts (call it Cut X), the program cr...
-
Matheus Ota commented,
Hi Eli, The beginning of my code is the following: // integer solutionif (where == GRB_CB_MIPSOL){ solution_value = &CutsCallback::getSolution; nodeCount = getDoubleInfo(GRB_CB_MIPSOL_NODCNT)...
-
Matheus Ota commented,
Hi Eli, Thanks for the fast response! This is the log presented by Gurobi: Optimize a model with 26 rows, 50 columns and 100 nonzerosVariable types: 0 continuous, 50 integer (50 binary)Coefficient ...
-
Matheus Ota created a post,
Early Branching in Branch-and-Cut
Hi, I'm have implemented a branch-and-cut algorithm using Gurobi, but in order to improve its performance, I want to detect when no significant changes happens during the (LP<->separation) loop, an...
-
Matheus Ota commented,
Hi Sonja, Thanks for the reply. I'm using Gurobi 8.1. The MIPGapAbs was exactly what I was looking for! Best, Matheus
-
Matheus Ota created a post,
Integer objective function
AnsweredHi All, I have a maximization model where the objective function is a real variable. But this variable is a sum of binary variables multiplied by integer weights. When solving the formulation with ...
-
Matheus Ota created a post,
Get current BnB node depth
AnsweredHi all, Is there any way of getting the current node depth in the GRBCallback? I know that it is possible to get the node count using GRB_CB_MIPNODE_NODCNT, and that if this count is zero, then we ...