SOS!!! I don’t know how to use pow_abs and log function with {convex}. I have a very weak foundation here. Can you give me the solution and some related web pages? (1). pow_abs with cvx

(2). And ‘log’ function use rel_entr function.

Use pow_pos(norm(...),3) instead of pow_abs(norm(...),3) for norm(...)^3.

pow_pos(norm(...),3)

pow_abs(norm(...),3)

norm(...)^3

1/norm(v) is neither convex nor concave. For instance, if v1) = v(2) = 1, its Hessian has one positive and one negative eigenvalue.

1/norm(v)

The log term is going to switch between convex and concave depending on the value of q^2.