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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.

vc 皮肤库 skin++包含了大量的皮肤文件，欢迎下载(vc skin, skin++ library contains a large number of skin files, please download )

用vc++实现的有关编译原理中的标识符问题，希望对大家有所帮助！(vc used to achieve the principle of compiler identifier, we hope to help!)

应用C++实现局域网内的文件传送和聊天功能(Application C++ Realize LAN file transfer and chat features)

说明：  USB协议1.1，2.0，3.0。带中文翻译(USB protocol 1.1, 2.0, 3.0. With Chinese Translation)

捕获局域网内的数据包，并从中的到数据，和相关信息，没开线程，我vc初学，欢迎朋友对它改进，别忘发我一份fecon@tom.com，用winpcap捕获.先安装winpcap3.1，注意改一下opnion里的lib路径(capture the data packets to and from the data, and related information, not open threads, I vc beginners welcome friends to improve it, do not forget that I made a fecon@tom.com with winpcap capture. Install winpcap3.1, to change it's lib opnion Path)

一系列包含串口、Modem、收发传真、终端仿真等方面的编程例子( A series of contains aspect the and so on string mouth, Modem, receiving and dispatching facsimile, terminal simulation programming example )

palabos用户指南，学习了解palabos开源软件必备材料(Palabos user guide to learn about palabos open source software essentials)

LPC4078官方代码，兼容LPC1788系列(LPC4078 official code)

这是一个云台控制的软件，我只是实现了上下左右，自动几个功能，为了测试用，不过可以调通。(This is a PTZ control software, I just realized vertical and horizontal, automatic several functions, in order to test, but can be transferred through.)