improve PI model

本程序介绍了相关算法在干涉仪侧向上的应用，具有很好的实时性。(This procedure describes the lateral correlation algorithm in the application of interferometer has good real-time.)

精确定位 虹膜的内外边缘，并分割出虹膜。(iris segmention。)

说明：  详细介绍了抗混跌滤波器的设计方法，阐述精辟(Details of anti-down filter design methods, the brilliant)

feature extraction in matlab simple intro

说明：  music算法','capon算法','bartlett算法',对比(MUSIC algorithm ','capon algorithm','bartlett algorithm ', comparison)

Matlab Functions for determining if certaion matrix is: 1) Symmetric 2) Lower/Upper triangular (Unit/Strictly/Non-Strictly) 3) n-Banded 4) (Strictly) Diagonally Dominant 5) Isn t it positive definite

Chapter 5 Matlab codes from AEMM book

alpha-beta滤波器的仿真程序，在雷达数据处理中有广泛应用。 本程序还比较了不同alpha-beta滤波器的性能。(This is a program about alpha-beta filter in radar data processing. )

通过比较自编MATLAB 的k-means 算法程序和SPSS 中自带的k-means聚类工具，对两个数据集聚类，并分析了聚类结果。(By comparing the k-means algorithm program of self-compiled MATLAB with the K-means clustering tool of SPSS, two data sets are clustered and the clustering results are analyzed.)

说明：  用matlab编写的几个小程序，有关于矩阵的计算，神经网络的训练。数据的输入输出等。(Matlab prepared with a few small procedures have on the calculation of the matrix, neural network training. Such as data input and output.)