永宁 赵

Gurobi-versary
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Latest activity by 永宁 赵

  • 永宁 赵 commented,

    1. Community
    2. Modeling
    3. Modeling of conditional constraints

    Hi Jaromił, Many thanks for your answer.   Kind regards, Yongning

  • 永宁 赵 created a post,

    Modeling of conditional constraints

    Answered
    1. Community
    2. Modeling

    Hi, Is there any way to modeling a conditional constraint like follows: if x > X0, then y = 1if x = X0, then y = 0 where x and y are decision variables, and X0 is a predefined constant number. Thanks.

    • 永宁 赵
    • 3 followers
    • 3 comments
    • 0 votes

  • 永宁 赵 commented,

    1. Community
    2. Modeling
    3. Any good practice for using bigM?

    Many thanks, Richard. That's quite informative and useful.

  • 永宁 赵 created a post,

    Any good practice for using bigM?

    Answered
    1. Community
    2. Modeling

    Hi, I am using many big-Ms in my model, which makes my coefficient statistics very bad. I think that is the main reason for the very slow solving of my optimisation. Matrix range [2e-02, 4e+06]Obj...

    • 永宁 赵
    • 3 followers
    • 3 comments
    • 0 votes

  • 永宁 赵 commented,

    1. Community
    2. Other
    3. Solution count

    Thanks, Eli. That helps a lot.

  • 永宁 赵 commented,

    1. Community
    2. Other
    3. Solution count

    Hi Eli, Many thanks for your answer. Are the 9 solutions the only feasible solutions the solver could find, or are they the best 9 feasible solutions selected among others?

  • 永宁 赵 created a post,

    Solution count

    Answered
    1. Community
    2. Other

    Hi, I am new to optimization and Gurobi, does anyone know what the "solution count" mean when it is greater than 1? Thanks. Yongning 

    • 永宁 赵
    • 4 followers
    • 5 comments
    • 1 vote