Carl Baier

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Recent activity by Carl Baier Recent activity Votes
  • Problems implementing Farkas Pricing

    Hello, I have the following problem. I am currently implementing Farkas pricing for my column generation that the model takes a long time to find a feasible solution that can serve as initial colum...

  • C1P/TU check in Gurobi

    Answered

    Hello, I wanted to ask if there is a possibility with Gurobi to check if the constraint matrix A has Total Unimodular (TU) or the Consecutive ones property (C1P). Thank you!

  • Branch-n-price implementation complications

    I have the following problem. I have a Nurse Rostering problem that is difficult to solve in reasonable time with large instances (and additional constraints, which I omit here for complexity reaso...

  • Problems adding columns "Only linear constraints allowed"

    Answered

    Hello, this is a follow-up post to this one. I updated my code quite a bit but there are still some problems remaining.  This is my code: from gurobipy import *import gurobipy as guimport pandas ...

  • Rostering problem with column generation

    Answered

    Hello, I would like to solve the following scheduling model with column generation.The indices are \(i\in I: Nurse\), \(s \in S: Shifts\) and \(t \in T: Days\). The decision variables are: \(x_{it...