demo-examples-2

this is a code in matlab for character recognition depending on correlation

信号处理，仿真模拟简单的信号传输，是一个简单的实例(It consists of a core program, which provides basic functions for mathematical computation and graphics, and various specific toolboxes providing specialised functions for various fields of engineering such as control systems and signal processing. We use Matlab for computer added learning for this project.)

计算机科学45部经典著作，深入C++之《C++ Primer》第三版，中文版，Stanley B Lippman，Josee Lajoie著，潘爱民，张丽 译(C++ Primer，Stanley B Lippman ，Josee Lajoie)

说明：  本Matlab代码提供了地理坐标丰富的转换功能：涵盖了经纬度坐标转东北天坐标；经纬度坐标转地心直角坐标；地心直角坐标转东北天；地心直角坐标转经纬度的功能；(This Matlab code provides a rich conversion function of geographic coordinates: covering latitude and longitude coordinates to northeast celestial coordinates; latitude and longitude coordinates to geocentric orthogonal coordinates; geocentric rectangular coordinates to northeast heaven; geocentric rectangular coordinates to latitude and longitude;)

PCA主成分分析，是一种常用的基于变量协方差矩 阵对信息进行处理、压缩和抽提的有效方 法。 (PCA principal component analysis, is a common and effective method is based on the covariance matrix of variable information processing, compression and extracted.)

其实popupwindow用起来比Dialog 方便，因为dialog一切都需要你自己来实现，而popupwindow帮我们实现了很多，我认为在使用的时候关键我们要看清参数： popupWindow.showAtLocation(parent, gravity, x, y) parent这个是一个父view试图， gravity 这个默认是居中，我们要指定显示方式：Gravity.LEFT | Gravity.TOP 最后两个参数就是显示的坐标位置，这样就可以根据需求自己定位显示位置了

离散傅立叶变换已成为数字信号处理的重要工具，然而，它的计算量较大，运算时间长，在某种程度上却限制了它的使用范围。快速算法大大提高了运算速度，在某些应用场合已能作到实时处理，并且开始应用于控制系统。(Discrete Fourier Transform digital signal processing has become an important tool, however, the calculation of its larger, long computing time, but in a way limits the scope of its use. Fast Algorithm for greatly enhanced speed of operation, in some applications has been able to do real-time processing and control system began to be used.)

Matlab仿真：采样次数与信号的信噪比的关系曲线图。(Matlab simulation: the number of samples and the signal to noise ratio of a plot.)

Matlab Recips for Earth Sciences--2nd Edition

Level implements Serializable.