Decision Optimization

Decision Optimization

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"Warning: no solution found from MIP start values." - rounding problem?

  • 1.  "Warning: no solution found from MIP start values." - rounding problem?

    Posted 08/26/08 07:17 PM

    Originally posted by: SystemAdmin


    [thiago.serra said:]

    Hi everyone,

    I'm trying to give a starting solution to my MIP model, but I believe I have some problem with rounding on floating-point inventory decision variables. Giving only the integer variables, is there any way in which I could ask for the pre-solver to attain values to the inventory variables based on constraint propagation?

    Thanks a lot,
    #CPLEXOptimizers
    #DecisionOptimization


  • 2.  Re: "Warning: no solution found from MIP start values." - rounding problem?

    Posted 08/27/08 08:42 PM

    Originally posted by: SystemAdmin


    [MaryFenelon said:]

    You can specify a MIP start with only the integer variables, and CPLEX will compute values for the rest if it can.  If you give values to all integer variables, CPLEX needs to solve the continuous problem to get these values.  If you give values to only some of the integer variables, CPLEX needs to solve a sub-MIP to get the rest of the values.  The sub-MIP solve is limited to the number of nodes set by the parameter SubMIPNodeLim.
    #CPLEXOptimizers
    #DecisionOptimization


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