How cvx solve problem?

[ali_darabi]

is cvx working good on optimization complex variables?
because of

Error in square_abs related to reshape

it is interesting for me square_pos(abs(3+4i))---->ans =-1 but abs(3+4i)---->ans =5 what is wrong? But square_abs(3+4*i)—>ans =25 so square_abs is better than square_pos.

thanks.