%-----------------------------------------------------------------
% exa020804_zplane.m, for example 2.8.4
% to test zplane.m and to obtain the pole-zero plot.
%-----------------------------------------------------------------
clear;

b=[.001836,.007344,.011016,.007374,.001836];
a=[1,-3.0544,3.8291,-2.2925,.55075];

subplot(221);
zplane(b,a); % 求并畫出所給系統的極零圖，該系統為IIR系統；

b=[1 -1.7 1.53 -0.68];
a=1;
subplot(222);
zplane(b,a); % 求并畫出第二個系統的極零圖，該系統為FIR系統；