根据协变矩阵和求最小特征值的方法求出三维点云数据的法向，根据OpenGL实现可视化,程序实用.-Noraml directions of 3D points can be obtained by calculating the smallest eigenvalue of covariance matrix, also, the method can be visualized by OpenGL, which is practical.

把Carstensen和Jun Hu（见SIAM JNumer Anal，2007，107：473—502）建立的残差型误差指示子，移植到特征值问题EQ1^not元近似。给出了Matlab程序，计算结果说明该指示子是有效和可靠的。-The Carstensen and Jun Hu (see SIAM JNumer Anal ,2007,107:473-502) to establish the residual type error indication son, transplanted t

Use matlab intelligent predictive control algorithm, Calculate the maximum eigenvalue judgment matrix of AHP, Modern signal processing jobs when the graduate.