Log({convex}) but in my problem is log(affine)

1

Hello everyone,
this is my problem

P2-1
P2-1813×290 35.1 KB

the objective function is concave but there is a error : Illegal operation: log( {convex} ).
this is my code
image
image959×250 12.8 KB

thanks everyone!

2

It is affine on paper, but in the code below you have abs.

3

Dear Michal:
thanks! I replace the abs to real, it work thank you!