How should I represent expressions in the picture in CVX？

[Mark_L_Stone]

Why didn’t you use the reformulation I provided in your previous topic?

How to modify errors in my CVX code？

@Michal_Adamaszek 's refromulation at How to express the function "1/(exp(x^2)-1)" - #2 by Michal_Adamaszek works for your case. Use 2^x instead of exp(x), and it can all be vectorized. cvx_begin; variable X(1,K) nonnegative variable t(1,K) nonnegative 1 >= 2^(-X) + inv_pos(1+t) % Use t in place of your g cvx_end Please check to make sure I didn’t make any mistakes.