signalp9_35.m

经典《信号与系统》教程的matlab例程,对深入理解信号与系统相关概念有很大帮助

clear,close all;
t=-5:0.01:5;
%x=0.4*exp(-t).*cos(t).*u(t)+0.8*exp(-t).*sin(t).*u(t)-0.4*exp(t).*u(t);
%x=(t+1).*(u(t+1)-u(t))+(-t+1).*(u(t)-u(t-1));
x=u(t+1)-u(t-1);
y=x.*x;
b=-2;
a=[1 1 0 -2];
%h=impulse(b,a,t);
subplot(221)
plot(t,x)
hold on
plot(t,y,'r')
subplot(222)
plot(t,y)