Forum Discussion
Variable names in callback (Java API)
I construct a cut in a preintsol callback using variables from the model containing the callback. When constructing the model, I give the variables names (using withName(...)) and store them in a vec...
Daniel,
While I understand original versus "crushed" model, it's still unclear to me why Xpress behaves the way it does. The added cuts are expressed in terms of the original variables, not those of the presolved model. By that I mean that I create an instance of LinExpression and fill it with a linear combination of original variables. Since Xpress apparently understands that the column indices are from the original model (judging by the fact that it appears to implement the cut correctly), shouldn't the toString method of LinExpression look up the names of the original variables?
Paul