Access starting solution variables

Answered

Niccolò Bulgarini

• July 29, 2019 09:07

Hi all,

I'm using gurobipy and am setting starting values for some variables by using the .Start attribute. The initial solution is then correctly loaded.

After the optimization is done, how can I retrieve the values for all the variables related to the starting solution?

Maybe with a callback?

Or maybe it's possible to access all the solutions found? (it seems that the starting solution appears within the 'Solution count' list)

Thanks!

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• 

  Greg Glockner

  Gurobi Staff

  • July 29, 2019 15:51

  Try something like the following:

  m.optimize()
  for v in m.getVars():
    if v.Start != GRB.UNDEFINED:
      print('%s start %f, optimized %f' % (v.VarName, v.Start, v.X))

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