Disciplined convex programming error:

Cannot perform the operation: {invalid} .* {convex}

- z = feval( oper, x, y );

main

SCB(k) <= f_k(k)/phi(k) + B*T/log(2)/EPS*(log(q_kj(k,1))+1 -q_kj(k,1)*e_kj(k,1))+B*T/log(2)/EPS*(log(q_kj(k,2))+1 -q_kj(k,2)*e_kj(k,2));