dplyr package

current value of this position." Benefits: Operating system level support, higher efficiency, no lock mechanism, lower thread waiting, actually throw this task to the operating system. This theory is the foundation of the entire java.util.concurrent package. About Sun.misc.Unsafe A few questions 1) Four basic types of compareandset and Weakcompareandset implementations are the same? More Wonderful content: http://www.bianceng.cnhttp://www.bianc

---------------------------------------------------------------------------------------------------|---1. Independent service|----RPM Package default installed Service |---2. Based on XINETD servicesLinux Service Categories: ||----Source Package Installation ServicesTo query for installed services:RPM Package Installation Services: Chkconfig--list (check the serv

The company has a demand for encryption redis, there is a profile option Requirepass can set the password, but the company felt can be modified by the configuration file to disable the password, feel insecure, and then directly modify the source code (mandatory set Requirepass as a fixed password), The RPM package is perfectly safe. 1. Download the Redis source package Http://redis.googlecode.com/files/redi

In the CentOS system, the software installation program is quite complex, but the most common are two kinds: 1) One is the source code of the software, you need to build it yourself. This software installation package is typically a tar package that is compressed with gzip (suffix. tar.gz). 2) Another is the software executable program, you just install it can be. This software installation

Android under V4 V7 V21 etc package is an extended support package for Android system, just like Windows system patch a reason . Android expansion pack is mainly used to be compatible with the lower version, such as android3.0 after the emergence of Actionbar, if you want to use Actionbar, then the mobile phone system must be more than 3.0 to use, this will cause many users can not install the apk to lose

(i) Installation and backup system1. Install Windows 7probably a lot of people would say that installing Win7 who wouldn't, that's also used to say? Installed Win7 Indeed everyone will, but how to install the most suitable for the system package, it is not necessarily everyone will. Installation is the package of this, there is no good installation method, encapsulation is just in vain, please pay attention

Today, to install two identical applications on Android phones, I thought we could install different versions, tried them several times, and covered each other, so we could only try to modify the package name (package name) of the APK. Purpose Statement : This article is only to meet the needs of DIY, not to become a packaging party, stealing other people's work, the tools involved in this article are open

Reprint: Http://hxraid.iteye.com/blog/483115?page=3#commentsWe often read some resource files in the code (compared to slices, music, text, etc.). These simple processes are of course not problematic when running alone. However, if we make the code into a jar package, even if the resource files are packaged together, these things will not be found. Take a look at the following code://Source code 1: PackageEdu.hxraid;ImportJava.io.*; Public classResour

Mysql interaction protocol analysis-mysql package basic data, mysql package basic format, mysql Interaction Mysql interaction protocol is a common protocol used to develop mysql peripheral components, such as JDBC and libmysql. Here we need to realize that the mysql interaction protocol is actually a half-duplex interaction protocol. As for why, we need to dig a small hole and fill it out later. Before disc

14.3 "Linux learning is not difficult"UseRPMSoftware packages (3): InstallRPMPackageRPM installation process for software packages 9.1 shown, if the package satisfies the dependency condition, the installation is allowed, and if the dependencies are not met, the other packages need to be installed first. Use rpm command can be Linux Install, delete, refresh, upgrade, query in the system RPM package. Command

Deb is the package format of Debian Linux. In general, we need to compile the source code and then create a deb package. Today, due to work needs, we want to package some existing files into a deb package, so we are struggling to find and study how to deal with it, finally, a packa