invalid could be input data having the value nan, which could occur if you use the variable value from a previous failed (maybe infeasible) CVX optimization as input for the current problem.
I just want to ask if you managed to write (38b) constraint on CVX. I have a constraint similar to it but I can not write the third and fourth term, it keeps give me errors.
So I will appreciate your help, if you can tell me the code of this constraint.