Christian Perau
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Christian Perauさんの最近のアクティビティ-
Christian Perauさんが投稿を作成しました:
Using -1 for lazy value gives wrong result
回答済み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 ...
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Christian Perauさんが投稿を作成しました:
Convert presolved model to original model
回答済み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 ...
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Christian Perauさんが投稿を作成しました:
Objective value does not equal X * obj
回答済み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...
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Christian Perauさんがコメントを作成しました:
Hi Marika, thanks for the hint to FeasibilityTol. That´s seems to do the trick. Still I will try to reduce the coefficient range. Thank you very much! Best regards, Christian
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Christian Perauさんが投稿を作成しました:
Model infeasible after using GRBfixmodel
回答済み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...
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Christian Perauさんがコメントを作成しました:
After a while I found the source. I call the C-code from within python (via ctypes dll). In the corresponding anaconda environment I had gurobipy 11.0.1 installed. After installing gurobipy 11.0.3 ...
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Christian Perauさんがコメントを作成しました:
Hi Riley, I don´t set the Username in the code. However, the license file seems ok and it does work the first 253 iterations. I removed all gurobi versions from my machine and installed 11.0.3 agai...
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Christian Perauさんがコメントを作成しました:
Hi Riley, yes I am using first GRBfreemodel and right after GRBfreeenv to free the memory. But I also monitored it in during runtime and the total memory usage of the machine was at its peak less t...
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Christian Perauさんが投稿を作成しました:
Out of memory though memory is not exceeded
ユーザーの入力を待っています。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...
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Christian Perauさんが投稿を作成しました:
Modelling squared euclidean distance in objective function (C-API)
回答済み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...