在工程实践和科学实验中，常常需要从一组实验观测数据之中找到自变量与因变量之间的关系，一般可用一个近似的函数来表示。函数的产生办法因观测数据和要求不同而异，数据插值和你和是两种常用的办法。-In engineering practice and scientific experiments, often from a set of experimental data to find the independent variables and dependent variable relationship between the general availability of a similar function to that. Function method for selecting the result of observational data and requirements vary, data interpolation and you and there are two commonly used methods.