理查逊外推法求数值微分，能达到很高的精度。-Richardson extrapolation method for numerical differentiation, to achieve high accuracy.

采用理查森外推法计算标量函数梯度的程序(很容易改写为计算雅克比矩阵)，算例为sin(x)+cos(y)。richarson(fun,x0)中，h是初始步长，j是迭代次数，精度是2*j+2阶。-Scalar function gradient procedures using Richardson extrapolation method, in the function richarson (fun, x0), h is the initial step, j is the number of

计算ln(x)，使用Taylor和Richardson两种主要方法。-Calculate the function ln(x)

Richardson 外推算法的实现 主要是数值分析课程的作业-Achieve Richardson extrapolation method is mainly job Numerical Analysis Course