exa1_23.m

新版Matlab 7辅助信号处理技术与应用

% exa1-23_multiply.m for example 1-23
% signal multiply

clear all;
n1=0:3;
x1=[2 0.5 0.9 1];
figure(1)
stem(n1,x1)
axis([-1 8 0 2.1])
n2=0:7;
x2=[0 0.1 0.2 0.3 0.4 0.5 0.6 0.7];
figure(2)
stem(n2,x2)
axis([-1 8 0 0.8])
n=0:7;
x1=[x1 zeros(1, 8-length(n1))];
x2=[zeros(1, 8-length(n2)), x2];
x=x1.*x2;
figure(3)
stem(n,x)
axis([-1 8 0 0.35])