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his little function rounds a number (or the elements of a vector ot matrix) towards the nearest number with N significant digits. Examples: roundsd(0.012345,3) returns 0.0123 roundsd(12345,2) returns 12000 This is a useful complement to Matlab s ROUND, ROUND10 and ROUNDN (Mapping toolbox), especially when dealing with data with a large variety of order of magnitudes. I was about to upload this file when I found "sd_round.m" by Edward Zechmann (see aknowledgment), which has similar feature (and more). But, because my script is very different in coding (much much shorter), I decided to share it anyway.

数学计算公式.多大数十种,科学计算,机器应用-mathematical formula. How dozens, scientific computing, machine application

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特别是刚刚接触嵌入式操作系统的朋友们不知道如何进行系统的安装及调试，为此我结合自己使用的切身体会，谈一谈它的安装及调试问题，希望对大家能起到一定的帮助作用-particular contact Embedded operating system just friends do not know how the system installation and debugging, Therefore, I have to use the light of their own personal experiences to talk about its installation and debugging. we can hope to play a helpful role

开发usb硬件相关文件，挺好用的，是转载过来的-Development usb hardware-related documents, very good use, and is reprinted from the

UML的重要资料，我看后获益匪浅，大家可以下载来看看，随便下载。-UML important information, I look after the benefit, everyone can download to look at, just download.

一个基于纯C++的简单的成绩管理系统，包括按照学号、姓名、成绩的查找，平均分，最低、最高分，及格和不及格人数等基本功能。使用的是双向循环链表结点模板

C程序常用公共符号定义头文件-C procedures commonly used definition of the first public sign documents