s104.m

本学期刚刚开始学习数字信号处理课程

n=-3:3;
x=[1,2,3,2,1,4,3];
N=length(x);
m=2;
n1=1;n2=3;
subplot(231);
stem(n,x);
y=[zeros(1,m) x];subplot(232);stem(y);
y=fliplr(x);subplot(233);stem(n,y);
y=sum(x(n1:n2));subplot(223);stem(y);
y=prod(x(n1:n2));subplot(224);stem(y);
Ex=sum(abs(x).^2)
Px=sum(abs(x).^2)/N