％绘制系统函数的零极点图
％
％pzplot(num,den)
％num为系统函数分子多项式的系数向量
％den为系统函数分母多项式的系数向量
％- Mapping system function pole zero diagram pzplot (num, den) num molecular function for the system polynomial coefficient vector den for the system function denominator polynomial coefficient vector
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