function fprime=c_8_p_5_fn_prime(x)
% The derivative (gradient) of the function we want to minimize
fprime = zeros(5,1);
fprime(1) = 0.5 * ( 4 * x(1)^3 - 32 * x(1) + 5 );
fprime(2) = 0.5 * ( 4 * x(2)^3 - 32 * x(2) + 5 );
fprime(3) = 2 * ( x(3) - 1 );
fprime(4) = 2 * ( x(4) - 1 );
fprime(5) = 2 * ( x(5) - 1 );