这种方法的特点是具有递推形式。
The character of this method is that, it has a recursive form.
证明了迭加原理公式的一般形式和递推形式。
The general and the recurrent formulae of the superposition principle are proved.
该算法具有梯度型递推形式，结构简单、容易实现。
The algorithm is featured by the gradient type recursive form, of simple structure, easy to be used.
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