Two possibilities, depending on how you want to depict it:
figure(1)
plot(w2,real(n), w2,imag(n))
grid
xlabel('w_2')
legend('Re','Im','Location','SE')
figure(2)
subplot(2,1,1)
plot(w2,abs(n))
grid
ylabel('Ampitude')
subplot(2,1,2)
plot(w2,angle(n)*180/pi)
grid
xlabel('w_2')
ylabel('Phase (°)')