I'm pretty sure I know the answer to this, but I'd like to check. As of CPLEX 20.1, is it not possible to get the dual values of the node LP in a generic callback (branching context)? I know we can get the primal variable values, as well as values of numeric expressions involving those variables, but I don't see a way to get the dual values of constraints (at least in the Java API).
Thanks,
Paul
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Paul Rubin
Professor Emeritus
Michigan State University
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#DecisionOptimization