사이에 있는 501개 등간격 점들에서  을 구하고 크기, 각도, 실수부, 허수부를 그려보자.

ex3_3.cem

w = [0:500:1]*pi/500;  /* [0, pi] axis divided into 501 points. */
 X = exp(j*w) ./ (exp(j*w) - 0.5*ones(1,501));
 magX = abs(X); angX = angle(X);
 realX = real(X); imagX = imag(X);
 subplot(2,2,1); plot(w/pi,magX);
 xtitle("frequency in pi units"); title("Magnitude Part"); ytitle("Magnitude");
 subplot(2,2,3); plot(w/pi,angX);
 xtitle("frequency in pi units"); title("Angle Part"); ytitle("Radians");
 subplot(2,2,2); plot(w/pi,realX);
 xtitle("frequency in pi units"); title("Real Part"); ytitle("Real");
 subplot(2,2,4); plot(w/pi,imagX);
 xtitle("frequency in pi units"); title("Imaginary Part"); ytitle("Imaginary")