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设r是f(x) = 0的根，选取x0作为r初始近似值，过点（x0,f(x0)）做曲线y = f(x)的切线L，L的方程为y = f(x0)+f (x0)(x-x0)，求出L与x轴交点的横坐标 x1 = x0-f(x0)/f (x0)，称x1为r的一次近似值。过点（x1,f(x1)）做曲线y = f(x)的切线，并求该切线与x轴交点的横坐标 x2 = x1-f(x1)/f (x1)，称x2为r的二次近似值。重复以上过程，得r的近似值序列，其中x(n+1)=x(n)－f(x(n))/f (x(n))，称为r的n+1次近似值(Let r is f (x) = 0 root, select the initial approximation x0 as the r, over point (x0, f (x0)) to do the curve y = f (x) the tangent L, L the equation y = f ( x0)+ f ' (x0) (x-x0), find the intersection of L and the x-axis of abscissa x1 = x0-f (x0)/f' (x0), x1 is called an approximation r. Through points (x1, f (x1)) to do the curve y = f (x) the tangent, and find the intersection of the tangent with the x-axis of abscissa x2 = x1-f (x1)/f ' (x1), x2 is called r the second approximation. Repeat the process, get an approximation of the sequence r, where x (n+1) = x (n)-f (x (n))/f ' (x (n)), as an approximation of r n+1 times)

这是用matlab实现的无约束优化方法 变量轮换法程序 (Unconstrained optimization method variable rotation method program matlab)

GPS for MatlabDetermination of the WGS-84 geoid height correction Determination of the WGS-84 geoid height correctionDetermination of the WGS-84 geoid height correction

输入是一个矩阵，运行程序后得到z字扫描后的向量，输入时一个向量，运行程序后得到的是逆序向量(matrix performs zigzaging or inverse zigzaging)

Schroeder 混响器，feedback comb filters，参考CCRMA。(Schroeder Reverberators)

这是一本描述随机过程在物理和生物系统中应用方面的书籍(Freund, J. A. et al.(eds)- stochastic processes in physics, chemistry, and biology- springer, 2000Springer.Verlag.Freund.Poeschel.(2002).Stochastic.Processes.in.Physics.Chemistry.and.Biology)

这是一个有关击中击不中变换的程序，已调试，可用(this is a program for hit/miss)

椭圆检测。利用霍夫变换的原理实现椭圆的检测，并在图中标记出来，可用于方向盘的检测。(Ellipse detection. Using the principle of detecting the implementation of elliptic Hof transform, and marked in the graph, can be used to detect the steering wheel.)

Two-dimensional Gaussian Q-function.

fdtd3D_UPML simulation