m0709.m

MATLAB仿真技术与实例应用教程

clear
N=100;
n=0:N-1;
xn=cos(0.5*pi*n)+sin(0.6*pi*n);
Xk=dft(xn,N)
subplot(2,1,1)
plot(n,xn)
ylabel('x(n)')
subplot(2,1,2)
k=0:length(abs(Xk))-1;
plot(k,abs(Xk));
ylabel('|X(k)|')