jake roth

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Recent activity by jake roth Recent activity Votes
  • GRB update environment

    Ongoing

    I am solving an optimization problem `P := min f(x) : x in X` where `X` has many linear constraints. To speed up the process, I instead consider solving a sequence of problems of the form `P^i := m...

  • Free model after interrupt (ctrl-c)

    Answered

    I am using julia, so my question might be more appropriate for the Gurobi.jl folks, but I was hoping to check here first to see if something is possible.   I have an optimization `model` that is cu...

  • Building a model with more than 2 billion nonzeros: GRBnewmodel vs GRBXaddvars

    Answered

    I am building an LP model with the C API that I know has more than 2 billion nonzeros, and I am wondering whether the best practice is to (1) initialize all of the variables and bounds with `GRBnew...

  • Retrieve relative gap and dual objective value

    Awaiting user input

    I am running a barrier method to solve an LP and a QP and would like to retrieve final residuals: primal infeasibility, dual infeasibility, relative objective value gap final dual objective value ...

  • Construct LP from matrix using GRBnewmodel, GRBaddvars, and GRBaddconstr

    Answered

    Hi, I am trying to use the C API to build an LP from scratch. I want to solve `max{c' * x : Ax <= b, x >= 0}`. In particular, I am using Julia and calling the `GRBnewmodel`, `GRBaddvars`, and `GRBa...