Victor Miller

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Latest activity by Victor Miller
  • Victor Miller created a post,

    Which heuristic was used

    Answered

    I see that by looking at Gurobi output that that when a new incumbent is found by heuristic, the line is marked by "H".  Is there some way (possibly using call backs) to find out which heuristic wa...

  • Victor Miller created a post,

    Conditional Constraints in Python: better error messages

    Answered

    It appears that MVars are not allowed in conditional constraints in the Python interface, but the error messages are rather mystifying.  For example import gurobipy as gp model = gp.Model() avars =...

  • Victor Miller commented,

    Eli, Thanks for the answer.  As a related question, is there a convenient way to sum MVars along an axis (as in numpy)?  

  • Victor Miller created a post,

    Incompatible Dimensions?

    Answered

    I'm using Gurobi 9.1.2 in Python.  The program below yields the message "Incompatible Dimensions".  This looks like a bug to me.  How do I add things with scalar variables to results from vector va...

  • Victor Miller created a post,

    Effect of more processors

    Answered

    I have a rather difficult model with binary variables and a quadratic (blinear) objective.  I first tried running Gurobi 9.1.2 on my desktop, which has 4 cores, and it was progressing fairly nicely...

  • Victor Miller commented,

    Unfortunately, the computer that I use Gurobi and Cplex on is not connected to the internet, so I can't really upload the file.  In relation to my other comment, the quadratic program that I genera...

  • Victor Miller created a post,

    Gurobi vs. Cplex -- lower bounds

    Awaiting user input

    I have an lp file (produced by Cplex) for a difficult MIP.  I tried running it on both Gurobi and Cplex to compare.  In both cases I didn't set any parameters.  Cplex almost immediately finds a fai...