现代控制理论的状态变量法提供了一种统一、高效的方法来描述具有任意阶次、线性或非线性、时变或常系数的各种系统。

The state variable approach of modern control theory provides a uniform and powerful method of representing systems of arbitrary order, linear or nonlinear, with time-varying or constant coefficients.

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每一次的失败，是走上成功的一阶。

Every failure, is a rung on the ladder of success.

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对每个候选变化点，经过一次判断即可确定多项式的合适阶次。

At each candidate change point, a reasonable order of the polynomial function can be determined by once estimating.

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