About {real affine}./ {real affine}

[shuafei (Mashauifei)]

t is variable, but i don’t konw the function how to express.

[jackfsuia (Jack)]

The expression has been given in the following

Express xlog(1+1/y) in cvx

As @Michal_Adamaszek has shown, x*log(1+x/y) = rel_entr(x+y,y) + rel_entr(y,x+y) , which is convex (not concave). So if your post has a typo and is supposed to have x/y rather than 1/y, here is the formulation to use. Otherwise, you’re out of luck with CVX, as @jackfsuia says.

[shuafei (Mashauifei)]

thanks you responce , the x*log(1+x/y) = rel_entr(x+y,y) + rel_entr(y,x+y) is feasible

[Mark_L_Stone]

What do you mean by “infeasible”. The optimization problem is infeasible or it is not possible for you to use this formulation?

[shuafei (Mashauifei)]

It is feasible.it is possible to use this formulation. i had modified