%信號相加、相乘
n1=1:5;
x10=[1 0.7 0.4 0.1 0];
n2=3:8;
x20=[0.1 0.3 0.5 0.7 0.9 1];
n=1:8;
x1=[x10 zeros(1,8-length(n1))];
x2=[zeros(1,8-length(n2)) x20];
x=x1+x2;                %信號相加
y=x1.*x2;               %信號相乘
subplot(4,1,1),stem(n,x1);
subplot(4,1,2),stem(n,x2);
subplot(4,1,3),stem(n,x);
subplot(4,1,4),stem(n,y);