Making -power(log(1+x),2) DCP complaint for maximization

1

I am maximizing a function for the form: -1*power(log(1+x),2)

log(1+x) is concave
-1*power(expression,2) is concave
So it should work

But CVXPY looks at -1*power(expression,2), ignores the negative, labels it as convex, and says it’s not DCP compliant.

Any workarounds?

2

This is a forum about CVX in Matlab and not CVXPY.

However the DCP rules are the same for both. And a quick look at the plot will immediately tell you that the function

(\log(1+x))^2

is neither convex nor concave.

3

Reference for the fact Michal states see: