Digital Integrator as low pass filter | Frequency Response of Digital Integrator

%Code:-

w=-pi:0.01:pi;

num=[1];

den=[1 -1];

h=freqz(num,den,w);

subplot(2,1,1);

plot(w,abs(h));

ylabel('Magnitude');

subplot(2,1,2);

plot(w,angle(h));

ylabel('Phase');