I am a full-time consultant and provide services related to the design, implementation and deployment of mathematical programming, optimization and data-science applications. I also teach courses and workshops. Usually I cannot blog about projects I am doing, but there are many technical notes I'd like to share. Not in the least so I have an easy way to search and find them again myself. You can reach me at erwin@amsterdamoptimization.com.
Friday, May 16, 2008
Cplex message
Have not seen this error before. This does not bode well for this model.
This is a response to a rather old posting by now, but I can tell you that CPLEX 11.1 contains an enhancement to Solution Polishing that makes the condition vanishingly rare. In most cases the error message used to come when a solution provided to CPLEX did not fit the presolved model; for example, perhaps presolve can prove that in any optimal solution, x=0, and yet x=1 is a perfectly feasible (but suboptimal) choice. CPLEX 11.1 now handles this case.
John Gregory CPLEX Product Manager ILOG, an IBM Company
This is a response to a rather old posting by now, but I can tell you that CPLEX 11.1 contains an enhancement to Solution Polishing that makes the condition vanishingly rare. In most cases the error message used to come when a solution provided to CPLEX did not fit the presolved model; for example, perhaps presolve can prove that in any optimal solution, x=0, and yet x=1 is a perfectly feasible (but suboptimal) choice. CPLEX 11.1 now handles this case.
ReplyDeleteJohn Gregory
CPLEX Product Manager
ILOG, an IBM Company
Indeed: I can confirm I have not seen this message recently.
ReplyDelete