Jose Vindel

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Hello, I would like to save my user cuts and lazy cuts into an lp file. my cuts are inserted via callbacks. I tried just to save the complete model using: model.write(filename.lp) However, the lp ...

• Jose Vindel
• March 27, 2023 17:26
• Edited
• 2 followers
• 5 comments
• 0 votes

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Hello, I have defined a function to solve an algorithm. This function has worked before with other instances, now I am testing the algorithm with another instance but I get the following traceback ...

• Jose Vindel
• January 24, 2023 16:50
• 2 followers
• 15 comments
• 0 votes

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Hello, I am trying to write a piece of script with different methods to solve a problem. This problem has a set of constraints and variables that don't change but the methods do. Each method adds c...

• Jose Vindel
• April 04, 2022 17:28
• 2 followers
• 2 comments
• 0 votes

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Hello,  I am trying to save a .lp file of the model I am working on. However, I would like to save it in a different directory. My plan is to have a folder where the scripts are and another folder ...

• Jose Vindel
• March 25, 2022 14:07
• 3 followers
• 4 comments
• 0 votes

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Hello,  Just a question, can you update the ObjBound in a MIPSOL? I was reading the documentation and came across  Var.setAttr(GRB.Attr.UB, 0.0) My question is can I do something like this? def laz...

• Jose Vindel
• February 04, 2022 18:36
• 2 followers
• 3 comments
• 0 votes

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Hello,  I am trying to code a program from the following model: \[\text{max}\, \nu_t\] \[\text{st.}\] \[\sum S_{ij}*v_j = b_j\] \[-\nu_j \leq -LB_j\] \[\nu_j \leq UB_j\] \[-\nu_t \leq \nu_{threshol...

• Jose Vindel
• August 10, 2021 16:59
• Edited
• 2 followers
• 7 comments
• 0 votes

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Hello, I am trying to code an algorithm using defined functions in python and then add a lazy constraint, I took the work done in tsp.py as an example and guide. However, I get the following error:...

• Jose Vindel
• February 22, 2021 15:27
• Edited
• 3 followers
• 4 comments
• 0 votes

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Hello, Just a brief question, does gurobi get some beneficial computing time when the data is an array over a list? let's say I am using python and my input data is a list from a csv file, of cours...

• Jose Vindel
• January 26, 2021 20:23
• 3 followers
• 4 comments
• 0 votes

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Hello,  I am trying to solve a model using lazy cuts, I've given a look on the example, to the best of my knowledge I am using it right, however, I guess not since I get this error   TypeError ...

• Jose Vindel
• May 11, 2020 18:29
• 3 followers
• 10 comments
• 0 votes

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The status of the model I am working on is GRB.INF_OR_UNBD, I am interested in getting the values of my variables so, I tried with callback get solution but I don't seem to get any values for my va...

• Jose Vindel
• April 22, 2020 16:48
• 3 followers
• 4 comments
• 0 votes