Matheus Ota
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Matheus Otaさんの最近のアクティビティ-
Matheus Otaさんがコメントを作成しました:
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...
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Matheus Otaさんがコメントを作成しました:
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...
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Matheus Otaさんがコメントを作成しました:
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 ...
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Matheus Otaさんが投稿を作成しました:
Suggestions for debugging double free error?
回答済みHi,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...
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Matheus Otaさんがコメントを作成しました:
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)...
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Matheus Otaさんがコメントを作成しました:
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 ...
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Matheus Otaさんが投稿を作成しました:
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...
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Matheus Otaさんがコメントを作成しました:
Hi Sonja, Thanks for the reply. I'm using Gurobi 8.1. The MIPGapAbs was exactly what I was looking for! Best, Matheus
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Matheus Otaさんが投稿を作成しました:
Integer objective function
回答済みHi 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 ...
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Matheus Otaさんが投稿を作成しました:
Get current BnB node depth
回答済みHi 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 ...