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转载 上拉电阻 下拉电阻
上拉电阻怎么把电压往上拉?wsssyis比如3.3V电源加到IC上 加个上拉电阻 不是有压降了么?电压不是降低了么?怎么个上拉法?问题补充:开漏外接线路 直接把VCC加到漏级不行吗?加个电阻做什么?
2014-04-29 11:30:06
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转载 高电平和低电平
电子电路中高电平是电压高的状态,一般记为1 电子电路中低电平是电压低的状态,一般记为0 高低电平的划分对于TTL来说高电平是:2.4V-5.0V 低电平是:0.0V-0.4V 对于CMOS来说高电平是:4.99-5.0v 低电平是:0.0-0.01v 对于高低电平之间的电压属于不定电压 在这个电压下会使器件工作不稳定 比如有时电脑开机后有不正常现象,但重新启动后又没问题了.
2014-04-29 11:26:35
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转载 如何在Word 图表目录中只显示部分图题或表题内容(插入表目录)
使用样式Displaying only part of a heading or a caption in a table of contentshttp://www.docs.is.ed.ac.uk/skills/documents/3740/3740.pdfHow can I include only part of an image
2014-04-19 22:43:50
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转载 Use Cut in R to turn numeric into factors
Use cut to turn numeric into factors, click HERE for more info about cut.The flag you might be interested will the breaks=:If you only pass one number to that flag, it will divide the whol
2014-03-04 10:02:35
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转载 Tukey honest significance test for unequal sample sizes
Differences between species were tested for significance by anova using the Tukey honest significance test for unequal sample sizes (5% significance level).
2013-12-29 23:06:15
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转载 Fast ways in R to get the first row of a data frame grouped by an identifier
http://stats.stackexchange.com/questions/7884/fast-ways-in-r-to-get-the-first-row-of-a-data-frame-grouped-by-an-identifier
2013-12-26 11:45:28
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转载 R multcomp Tukey-Kramer
http://stackoverflow.com/questions/12375209/multcomp-tukey-kramer
2013-12-22 12:15:30
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转载 在给定范围中取不重复的随机数
在给定范围中取不重复的随机数 随机取m个数(在1到n的范围之内),(m,要求m个数没有重复。有没有什么好的算法,时间复杂度和空间复杂度都很好?方法一:用STL中的set集,红黑树来处理取随机数可以用C++标准的rand,至于M个不重复,用std::set来解决,把取到的随机数插入到set里面,通过set的size()==m来判断是否已取够m个了。#include
2013-06-25 11:42:15
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转载 Code::Blocks 使用 SQLite3
This is a little tutorial of how to use SQLite with Code::Blocks. It is assumed that you have already installed Code::Blocks with MinGW.This is the way I did it:1. Download sqlitedll-3_6_22.zi
2013-05-23 17:30:32
2020
翻译 C++ Code::Blocks + MinGW 配置 OpenMP 和例子
http://forums.codeblocks.org/index.php?topic=13104.0 配置OpenMP:1. "Settings -> Compiler and debugger setting-> Compiler settings-> Other options", 加入"-fopenmp” 2. "Settings -> Compiler and
2013-05-20 21:14:02
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转载 ParaView - Mixing NumPy and VTK APIs with high efficient using Python Programmable filter
ParaView的User Guides中关于Python Programmable filter中的一个例子。The previous examples demonstrate how the Programmable Filter can be used as an advanced Python Calculator. However, the full power of the
2013-05-19 17:24:14
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转载 C/C++ 遍历文件夹下的文件名(含子目录)
#include#includeusing namespace std;int main(){ _finddata_t file; long lf; //修改这里选择路径和要查找的文件类型 if((lf = _findfirst("F:\\2011Experiment\\*.*",&file))==-1l)
2012-06-12 12:04:08
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转载 C/C++ 遍历文件夹下的文件名(不含子目录)
#include using namespace std;int main(){ system("dir F:\\指定文件夹 /B >filelist.txt");}把文件名保存在“filelist.txt”中。http://zhidao.baidu.com/question/54600009
2012-06-12 11:52:36
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原创 C++ 结合 Boost:40行代码读写和处理 txt 文件
C++ 结合 Boost:40行代码读写和处理 txt 文件#include #include #include #include #include using namespace std;using namespace boost;int main (){ string stringLine; ifstream infile; vector temp
2012-03-30 17:22:22
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原创 对比sqlite3_exec 和sqlite3_bind 插入100万行数据的速度 with BEGIN TRANSACTION using C++ and SQLite
使用sqlite3_exec 插入100万行数据需要 27 s,而使用sqlite3_bind_double 插入100万行数据只需要3.7 s。主要是因为采用sqlite3_exec(),相当于每插入一行数据同时用到sqlite3_prepare_v2(), sqlite3_step() 和 sqlite3_finalize(),另外需要把double 强制转换成 string 然后再转换成
2012-03-26 11:06:08
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原创 在XP/WIN7系统下使用Codeblocks与MinGW编译VTK
下载最新版本的Codeblocks+MinGW.exe,CMake.exe,vtk.zip和vtkdata.zipCodeblocks+MinGW10.05.exe Cmake-2.8.3-win32-x86.exe Vtk-5.6.1.zip Vtkdata-5.6.1.zip 在根目录下建C:/VTK,新建vtkSource和vtkData文件夹(不能有空格),将vtk源码
2012-03-20 10:49:41
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转载 Using SQLite in C++ with Code::blocks
What you will need:-Basic C++ and SQL knowledge-SQLite (Download)IntroductionSQLite is an embedded SQL database engine. Unlike most other SQL databases, SQLite does not have a separate ser
2012-03-19 12:07:02
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CppSQLite 3.2 for SQLite 3.4.0
2012-04-07
Effective C++ 3rd Edition 55 Specific Ways to Improve Your Programs and Designs (PDF)
2010-08-02
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