Lin Lin

Gurobi-versary
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Activity overview

Latest activity by Lin Lin

  • Lin Lin commented,

    1. Community
    2. Algorithms
    3. How does Gurobi 10.0.0 handle quadratic constraints?

    Hi Jaromił, I believe I implemented my model as you described in the first case, and all my questions are resolved! Thank you so much for all the help! Best regards, Lin

  • Lin Lin commented,

    1. Community
    2. Algorithms
    3. How does Gurobi 10.0.0 handle quadratic constraints?

    Hi Jaromił, Thanks again for the answer! So here is the quadratic constraint in my model (with a linear objective): where A is the linear terms in that constraint, Cij is a known parameter that is...

  • Lin Lin commented,

    1. Community
    2. Algorithms
    3. How does Gurobi 10.0.0 handle quadratic constraints?

    Hi Jaromił, Thanks for the extensive answer. Please allow me for a few more questions: Yes, this is the standard technique to deal with convex quadratic term when the whole model is determined to ...

  • Lin Lin commented,

    1. Community
    2. Algorithms
    3. How does Gurobi 10.0.0 handle quadratic constraints?

    Hi Jaromił, Thank you so much for the informative response! If you allow, I have 2 follow-up questions based on your answers: 1. I have two x*y terms in the quadratic constraint, one is linearizabl...

  • Lin Lin created a post,

    How does Gurobi 10.0.0 handle quadratic constraints?

    Answered
    1. Community
    2. Algorithms

    I have a quadratic constraint in my model (with linear objective) and while I solve it in Gurobi, I didn't see the error message GRB_ERROR_Q_NOT_PSD. Given that, I got questions: 1. Since I didn't'...

    • Lin Lin
    • Edited
    • 4 followers
    • 10 comments
    • 0 votes

  • Lin Lin commented,

    1. Community
    2. Programming
    3. Heuristic not used

    Hi Jaromił,   Thank you so much for the helpful answer! Yes, I believe the feasible points exist and I've seen feasible solutions have been found. I do have one more question related to this: there...

  • Lin Lin created a post,

    Heuristic not used

    Answered
    1. Community
    2. Programming

    Hi there,   I'm using Gurobi to solve a very large problem that may take a few days. However, I observed that in the first 48 hours no heuristic was used, and no feasible solution had been founded ...

    • Lin Lin
    • Edited
    • 2 followers
    • 3 comments
    • 0 votes

  • Lin Lin created a post,

    Dealing with repeatedly read in constraints

    Answered
    1. Community
    2. Programming

    Hi there! I'm trying to solve a large location-allocation problem by first find the location variable values with some metaheuristic and then use Gurobi to find allocation variable values. Thus it ...

    • Lin Lin
    • 3 followers
    • 2 comments
    • 0 votes