MLS（移动最小二乘）
1.拟合函数的建立不同。这种方法建立拟合函数不是采用传统的多项式或其他函数，而是通过系数向量和基函数来决定在某个x处的值。

2.引入紧支的概念，认为在x处的值y只受到x附近子域内的节点的影响。这个子域称作是x的影响区域，影响区域外的节点对x处的取值没有影响。影响区域内的每个节点对x处的取值的影响是不一样的。所以需要一个权函数来定义每个节点的影响。(MLS (Moving Least Squares)
July 25, 2018 15:42:20 blank_downdowndown reading: 1593
1. The establishment of fitting function is different. This method does not use traditional polynomials or other functions to establish fitting functions, but determines the value at a certain X by coefficient vectors and basis functions.
2. By introducing the concept of compact support, it is considered that the value y at x is only affected by the nodes in the subdomain near X. This subdomain is called the influence area of x, and the nodes outside the influence area have no effect on the value of X. The effect of each node in the affected area on the value of X is different. So a weight function is needed to define the impact of each node.)