{real affine} .* {convex}？The f(x1,x2) = a*x1*log(1+b*x2./(c*x1)) is a concave function or not? a>0,b>0,c>0

[error2233]

There is a question about “Cannot perform the operation:{real affine} .* {convex}

，”，how to deal with it?B、gain1，gain2，N0，D0，D1，D2，f0，f1， f2，C are constant and > 0。
Professional professor, I need your help very much。
@ Mark_L_Stone

[Mark_L_Stone]

x*log(1+y/x) can re reformulated as -rel_entr(x,x+y)

I will leave you to figure out what the x and y in your problem are.

[error2233]

it works thank you very much，you are my god!