dm12502.m

the code of the book come form the book of marlix laboratory with the book of singal

%dm12502
%绘制系统（1）零、极点分布图及冲激响应时域波形 
num=[1]; 
den=[1 2 17];
sys=tf(num,den);
set(gcf,'color','w')
subplot(3,2,1);
pzmap(sys); 
subplot(3,2,2);
impulse(num,den); 
%绘制系统（2）零、极点分布图及冲激响应时域波形 
num=[1 8]; 
den=[1 2 17];
sys=tf(num,den); 
subplot(3,2,3);
pzmap(sys); 
subplot(3,2,4);
impulse(num,den);

%绘制系统（3）零、极点分布图及冲激响应时域波形 
num=[1 -8]; 
den=[1 2 17];
sys=tf(num,den); 
subplot(3,2,5);
pzmap(sys); 
subplot(3,2,6);
impulse(num,den);