Victor Miller
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Recent activity by Victor Miller-
Which heuristic was used
AnsweredI 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...
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Conditional Constraints in Python: better error messages
AnsweredIt 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 =...
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Incompatible Dimensions?
AnsweredI'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...
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Effect of more processors
AnsweredI 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...
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Gurobi vs. Cplex -- lower bounds
Awaiting user inputI 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...