一个二元插值函数的连续性与可导性

给了三维空间上的N个数据点(x_1,y_1,z_1),(x_2,y_2,z_2),…,(x_N,y_N,z_N),这些数据点可能是观察得到的实验数据,也可能是科技计算中得来的离散数据;就其物理背景来说,可以是大地测量中各观察点的高度;海洋的深度;温度场中各点的温度;气象测量中各地的气压;建筑物体各点的压力等等。根据这些离散的数据点,用计算机绘制等值线图时,首先必须通过这些数据点去拟合一个光滑曲面。也就是要建立一个满足条件

CONTINUITY AND DERIVABILITY FOR AN INTERPOLATION FUNCTION OF TWO VARIABLES

(1) In this paper, we give an example, which shows that che interpolationfunction by Shepard is discontinuous under some cases. (2) We prove that interpolation function by Shepard is continuous if datum location cansatisfy some conditions, which can not get guarantee the existence of partial derivative.