关于离散的拉氏函数，可以进一步的用有限元法去离散。
给定一个椭圆方程，我们先找出这个方程的拉氏函数，用差分代替微分，得到离散的拉氏函数。
At first we can get the Lagrangian function from the elliptic equation, then replace differential coefficient by difference and get the discrete Lagrangian function.
在传递函数模型中，这些方程经过（拉氏）变换，并消去中间变量，以求得所选定的输入输出变量间的关系。
In transfer function models these equations are transformed and variables are eliminated between them to find the relation between selected input and output variables.
利用幂函数描述产量与压力值，并通过拉氏变换进行校正，可将抽油井测压早期段数据校正到径向流段，从而大大缩短抽油井测压时间。
Using power function to describe the production rate, pressure and translating them into laplace space, the early time testing data of the pumping well can be modified to the radio flow period.
而待定函数F的识别类似于拉氏乘子的识别。
The unknown function F can be easily identified like the identification of Lagrange multipliers.
而且拉氏域很好运算，传递函数可以很容易运算、修改和分析。
Furthermore, the Laplace domain is a nice place in witch to work, and transfer functions may be easily manipulated, modified, and analyzed.
实例计算表明，相对于周期函数响应求解中通常采用的拉氏变换方法，本方法更为简便，并有广泛的适用性。
It has been proved by the example calculation that this method is simpler and more applicapable in comparison to La's transformation commonly used in resolving the response of periodic function.
实例计算表明，相对于周期函数响应求解中通常采用的拉氏变换方法，本方法更为简便，并有广泛的适用性。
It has been proved by the example calculation that this method is simpler and more applicapable in comparison to La's transformation commonly used in resolving the response of periodic function.
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