How to express x*log(y) Nonconvex Mar 28, 2017 V Vannel Mar 28, 2017 #1 variable x variable y expression z z=x*log(y) How to express x*log(y) in cvx? Thanks M Mark L. Stone Mar 28, 2017 #2 This is neither convex nor concave, so can not be expressed in CVX.