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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.

无刷电机资料，经典的电机的速度PID控制程序，极其好，找了好久找到的。-Brushless motor information, the classic PID motor speed control procedures, is extremely good, looking for a long time to find.

国防工业部VB高级编程源码-defense ministry source VB Advanced Programming

FLASH游戏.现在上传给大家,一起交流学习.-FLASH game . From now to everyone, with the exchange of learning.

很好的英语学习资源,对词汇量的提高十分有益。-Very good English learning resources, improve vocabulary and useful.

remote retail billing system

征管辅助，可以打印税收通用完税证等一些常用的税收票据，代码简单，其中包含了小写数字转换成金融大写数字的程序。-collection and management support, can print tax general tax certificate and some other popular tax bills, code simple. it covers a lowercase converted into financial capital figures procedures.

坐标转换，适应与地理信息系统的各种坐标系统换算-Coordinate transformation, adaptation and geographic information system coordinate system conversion

自用java开发包。 包含mail,io,net,sort,security,http,chache等等内容。-Occupied java Development Kit. Contains mail, io, net, sort, security, http, chache etc. content.

给大家交流几个C++数学函数。-to exchange a few C math functions.