协方差矩阵、相关线性矩阵、特征值计算

说明：  在autocad2007环境中直接使用API就可以亮显实体的一个示例演示(This program demonstrates how to use ObjectARX API functions to highlight and unhighlight subentities of complex entities such as ACIS solids.)

DES( Data Encryption Standard)算法，于1977年得到美国政府的正式许可，是一种用56位密钥来加密64位数据的方法。虽然56位密钥的DES算法已经风光不在,而且常有用Des加密的明文被破译的报道,但是了解一下昔日美国的标准加密算法总是有益的,而且目前DES算法得到了广泛的应用,在某些场合,她仍然发挥着余热.（如：UNIX的密码算法就是以DES算法为基础的）。将其修改为三重DES也能抵抗破解。下面是关于如何实现DES算法的语言性描述：(DES ( Data Encryption Standard ) algorithm, in 1977 the U.S. government s official permission , is a 56 -bit key to encrypt 64 data . 56 keys of the DES algorithm scenery is not , and often with Des encryption expressly decipher reported , but look at the old standard encryption algorithm is always useful , but the DES algorithm has been widely used in a some occasions , she still plays a waste heat . (such as : UNIX password algorithm is DES algorithm -based ) . To modify the Triple DES is also resistant to cracking . The following is a description language on how to achieve the DES algorithm : )

Visual C# 2005文件IO与数据存取的相关知识，内容全面，结构合理，论述清晰，对Visual C# 2005文件IO与数据存取技术及其实际应用都有独到见解，是一本专业性较强的计算机书籍。这是书的第五章代码-Visual C# 2005 file IO and data access-related knowledge, comprehensive, well-structured, clear exposition of the Visual C# 2005 file IO and data access technology and its practical application have a distinct point of view, is a highly professional computer books. This is the fifth chapter of the code book

工业控制监控软件，画动态曲线. 仪表盘显示。(Painting dynamic curve. Draw dynamic curve the painting dynamic curve. Draw dynamic curve)

超声波的壁障方案,该方案可以确保APM能正常的使用和加载超声波模块，可以进行自动话壁障和自动导航！(ultrasonic barrier scheme)

主流的32位MD5加密算法在.NET2003平台上的实现（WINFORM模式）例子，如果你希望给自己的项目加入安全机制但却对MD5加密未曾接触，那可能这个例子可以给你一点帮助(mainstream 32 MD5 encryption algorithm.NET2003 platform achievement (WINFORM mode) example, if you want to own the item by adding security mechanisms but right MD5 encryption has not been exposed to, That may be the case can give you a little help)

说明：  fastled用来控制led灯带的使用，色彩变换与各种有趣的设计(Fasted is used to control the use of LED light strips, color conversion and various interesting designs)

利用Active控件实现计时器,图形显示等(To Timer.)

曲面响应法的简易教程。可以通过此法，用程序实现最优化设计。算法复杂度低。(An easy tutorial for RMS)

hospital management system to record students info with billing info