轻松实现GM模型的操作 GM(1-N)

用互相关原理实现控制系统的频率特性测试仿真，供大家参考。谢谢！！(Using the principle of inter-related control systems achieve the frequency characteristics of the test simulation, for your reference. Thanks! !)

passive tracking algorithm

说明：  MATLAB中画椭圆的自定义函数：ellipse，用后才会发现这个函数的强大功能！ 在ellipse之函数当中，其输入之变数分别如下： -ra 椭圆之长轴半径，可为列矩阵，若为列矩阵时，代表可同时绘制许多椭圆。 -rb 椭圆之矩轴半径，可为列矩阵，如ra。 -ang 水平轴之倾斜角，以弧度表示。可为列矩阵，但ra、rb、ang三者之矩阵数应相同。 -x0,y0 圆心之座标，可为矩阵，若为矩阵时，代表可同时绘制许多不同圆心位置之椭圆。 -C 椭圆线之颜色 -Nb 绘椭圆时所用之点数。(MATLAB in the oval painting custom function: ellipse, will be found after using the power of this function! Ellipse of the function in which its input variables are as follows:-ra ellipse of major axis radius for the column matrix, if for the column matrix, a representative may at the same time drawing many elliptical. oval-rb-axis radius of the moment for column matrices, such as ra.-ang horizontal axis of the tilt angle to radians. Matrix for the column, but ra, rb, ang among several of the matrix should be the same.-x0, y0 the coordinates of the center for the matrix, if for the matrix, a representative may at the same time drawing a number of different oval center location.-C elliptic line color-Nb painted oval of points used.)

System identification

一种基于图像特征点提取及匹配的方法 (A method based on image feature extraction and matching)

用于数字水印的添加，可以根据幅度的大小自动调节水印幅度，用直扩2psk实现(Used to add a digital watermark, the watermark can be automatically adjusted according to the size of the magnitude of the amplitude with DSSS 2psk achieve)

iris with matlab.irisData is 150x5. row: Sepal.Length Sepal.Width Petal.Length Petal.Width Group(1,2,or 3) the first 50x5 is Isis-setosa(1), the second 50x5 is Isis-versicolor(2), the last 50x5 is Isis-virginica(3). !!! Caution !!! X(50 + 21, :) equals X(50 + 50 + 27, :), but Y(50 + 50 + 21) DOESNOT equal Y(50 + 50 + 27)! So the algorithm will NEVER be 100 correct.

说明：  SUI信道的仿真代码，很不错。有兴趣的人可以看看，1-6都有(SUI CHANNEL。very good，)

此篇文献是基于MATLAB的谱相减语音增强算法的研究，我写论文时给了我很大帮助，希望对大家也有用(This article will be based on MATLAB spectral subtraction speech enhancement algorithm, I wrote an essay gave me great help, we want to also be useful)

network security algorithm ceasar cipher codes, simple implementation