Originally posted by: savant_ning

Hi~thanks for everybody help,  I have a new problem:

Q2 is not convex, should I change the constraint to convex constraint? How can I check out  my constraint is convex?

thanks a lot

Regards

Yes, quadratic constraint have to be convex. You can learn about convexity in the user manual here: https://www.ibm.com/support/knowledgecenter/SSSA5P_12.8.0/ilog.odms.cplex.help/CPLEX/UsrMan/topics/cont_optim/qcp/04_convexity.html

It looks like you are adding a quadratic equality constraint? These are never convex.