Dong Han

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  • Total activity 23
  • Last activity
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  • Followed by 0 users
  • Votes 0
  • Subscriptions 6

Activity overview

Latest activity by Dong Han

  • Dong Han commented,

    1. Community
    2. Feature Requests
    3. FarkasDual and Barrier method

    Hi Riley, Thank you very much for your quick reply. It helps a lot !

  • Dong Han created a post,

    FarkasDual and Barrier method

    Answered
    1. Community
    2. Feature Requests

    Hello team, I am trying to use barrier method to solve a LP model. In some cases, my model will be infeasible and I would like to get the FarkasDual. The thing is I cannot access the FarkasDual sin...

    • Dong Han
    • 2 followers
    • 2 comments
    • 0 votes

  • Dong Han commented,

    1. Community
    2. Algorithms
    3. why GRBcbsolution doesn't work

    Yes, I provide a full feasible solution and its corresponding objective value to the model. And I verified in the way you suggested, the solution is absolutely feasible and the worse feasible solut...

  • Dong Han commented,

    1. Community
    2. Algorithms
    3. why GRBcbsolution doesn't work

    Hello Marika, Thank you for your response. The thing is, for example, the first solution I provided didn't be accepted when I used GRBcbsolution. And after a few iteration, the fifth solution I pro...

  • Dong Han created a post,

    why GRBcbsolution doesn't work

    Answered
    1. Community
    2. Algorithms

    Hello, I am trying to using GRBcbsolution to provide a feasible solution for my model when the where is equal to GRB_CB_MIPSOL. But I noticed at the beginning, the solution didn't show in the "Incu...

    • Dong Han
    • 3 followers
    • 5 comments
    • 0 votes

  • Dong Han created a post,

    barrier method early termination

    Answered
    1. Community
    2. Algorithms

    Hello, I try to use barrier method solve a LP problem. Since I would like to obtain an interior point, I try to terminate barrier method by setting "BarIterLimit" as 1. When I get the solution afte...

    • Dong Han
    • 2 followers
    • 1 comment
    • 0 votes

  • Dong Han created a post,

    Why the model is infeasible after adding lazy constraint

    Awaiting user input
    1. Community
    2. Algorithms

    I am coding with C++ to build a tsp model by using C API. The model became infeasible after I adding the first lazy constraint which is a subtour elimination constraint. But when I add this constra...

    • Dong Han
    • 3 followers
    • 1 comment
    • 0 votes

  • Dong Han commented,

    1. Community
    2. Algorithms
    3. Presolve for a very large LP

    Sure, here is the log information for solving the problem successfully.    Set parameter Username Academic license - for non-commercial use only - expires 2023-09-23 Gurobi Optimizer version 9.5.2 ...

  • Dong Han created a post,

    Presolve for a very large LP

    Answered
    1. Community
    2. Algorithms

    Hello, I am trying to solving a very large LP, I am confused why the number of constraints removed during presolve is lager than the number of constraints in the original model? Please read the fol...

    • Dong Han
    • Edited
    • 5 followers
    • 3 comments
    • 0 votes

  • Dong Han commented,

    1. Community
    2. Modeling
    3. Get multiply feasible solutions from solution pool for mip

    Thank you very much! Problem solved!