基于描述函数的定义和性质，提出了一种新的简便计算描述函数的方法。

This paper presents a new simple method for calculating the descriptive functions.

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给出了分段线性函数族的定义和有关的运算性质，利用这些性质得到直接求解变分问题的一种新的数值方法。

The definition of the Segmental Linear Functions and some operational properties are given. By means of the properties, a new numerical method for direct solving variational problems is obtained.

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利用球矢量波函数的定义及性质，提取出场的径向分量，将初级场分解为相对于径向的TE波和TM波，避免了复杂的矢量微分运算。

Using the definition and character of vector function, the field is separated to TM wave and TE wave relative tor without complex vector-differential operation.

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