CSharpbook

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.

此段程序，可用于交流电机设计，计算转矩，电磁力，磁通密度等，适用于Ansys软件，具有较强的参考价值。(This section program, can be used for AC motor design, calculation of torque, the electromagnetic force, the magnetic flux density for Ansys software, with a strong reference value.)

网络延迟测试工具。测试出网络速度带宽，大小( Network latency test)

关于labwindowsCVI的串口程序，很稳定，很全，包含rs232的基本操作。看了很多网上的例子，都不是很好，所以决定给大家奉献一个好的串口程序。(The serial program on labwindowsCVI, very stable, very wide, include rs232' s basic operation. Example, read a lot online is not very good, so I decided to dedicate a good serial program.)

RTCSample is a fully functional RTC application the uses the RTC Client API to expose Presence, Instant Messaging, and PC-to-PC audio/video call features.

使用vc++开发的云台镜头控制系统，主要通过串口实现控制，已编译通过，可学习使用(PTZ camera control system)

串口助手，帮助你解决你想解决的一切问题与麻烦(Serial assistant to help you solve all the problems you want to solve and trouble)

说明：  基于某一类零件的五轴运动平台机床控制程序(Control Program of Five-Axis Linkage Machine Tool)

说明：  BCB串口通讯源码示例程序。利用winapi函数，而非控件。(BCB examples of serial communication program source. Use WINAPI function, rather than control.)

RTCM3.0差分数据格式解码，将二进制的原始数据进行解码、转换为十进制的数据(RTCM3.0 differential data decoder)