Originally posted by: sticyjade

Today I used Cplex 10.0 in C# environment to solve a simple MIP programming problem. But an error emerged. The message said,"CpxRange for general expression". This happened when debugging the whole programme. It stopped at a statement as "cplex.AddEq(Cnorm, Cinv);" The type of "Cnorm" is INumVar and the one of "Cinv" is INumExpr. "Cinv" is the sum and product of various of INumExpr, IIntVar, and double. I'll appreciate it if you could give me some aids. Thanks.
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Originally posted by: RWunderling

Please check that your expression Cinv is indeed linear. Quadratic equality constraints are not supported by CPLEX as they would not be positive semi-definite.

Roland
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Originally posted by: sticyjade

Thank you for your help. Do all the other constraints methods, like AddLe(,), not support the quadratic expressions? If I have to use the quadratic form of constraints, is there any methods that I could utilize?
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