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tf–idf, short for term frequency–inverse document frequency, is a numerical statistic that is intended to reflect how important a word is to a document in a collection or corpus.[1]:8 It is often used as a weighting factor in information retrieval and text mining. The tf-idf value increases proportionally to the number of times a word appears in the document, but is offset by the frequency of the word in the corpus, which helps to control for the fact that some words are generally more common than others. Variations of the tf–idf weighting scheme are often used by search engines as a central tool in scoring and ranking a document s relevance given a user query. tf–idf can be successfully used for stop-words filtering in various subject fields including text summarization and classification. One of the simplest ranking functions is computed by summing the tf–idf for each query term many more sophisticated ranking functions are variants of this simple model.

基于ip的万维网网络时延测试代码，往返时延-Ip-based World Wide Web network latency test code, round-trip delay

说明：  实现图像游程编码的MATLAB程序，对二值图像压缩效果明显。(RLC)

今天尝试写一个小demo实现下之前看过的代码，目的了解不同文件的数据访问，掌握如何获取前台数据，如何将数据库的数据在前端页面展示。 awt可视化界面可已实现提交数据到数据库，也可查询数据在控制台打印。 web工程：主要是web前台输入并提交数据，然后在另一页面展示数据库内容(Today, try to write a little demo to achieve before the next read the code, the purpose of understanding the data access different files, learn how to get the reception of data, how the data in the to show the front page. awt visual interface has been implemented to submit data to the , query data can also be printed on the console. web project: mainly web frontend to enter and submit data, and then display the contents of the in another page)

SVM that uses eigen faces for face recognition

了解基本编程知识，熟悉编程算法，递归算法画五角星。(Understand basic programming knowledge, familiar with programming algorithm, recursive algorithm drawing pentagon.)

视频真实地址解析源码程序，结合易语言扩展界面支持库和易语言第三方WEB浏览器2.0版，调用API函数实现视频真实地址的解析。(Address resolution video real source program , combined with easy language support library interface and ease of language extensions to third parties WEB browser version 2.0 , call the API function to resolve the real address of the video .)

利用vc++ 6.0 编写的进行高斯消元法运算的代码(Using vc++ 6 prepared by Gauss elimination operation element method code)

通过SNMP查询来得到网卡信息，做软件授权可参考该功能-Through SNMP queries to obtain card information, the software is authorized to make reference to the function

说明：  barcode reader whit serial com