直接型到级联型的形式转换

％ [b0,B,A]=dir2cas(b,a)

％b 为直接型的分子多项式系数

％a 为直接型的分母多项式系数

％b0为增益系数

％B 为包含各bk的K乘3维实系数矩阵

％A 为包含各ak的K乘3维实系数矩阵

％-directly to the cascade-type conversion in the form of%% [belts, B, A] = dir2cas (b, a)% b-to direct the molecular polynomial coefficients% for a direct-denominator polynomial coefficients% of the gain coefficient belts% B To contain the bk K by the three-dimensional real coefficient matrix% A to include all ak K by the three-dimensional real coefficient matrix%