Linux （RedHat, CentOS）上升级R语言：
sudo yum install R
Windows上升级R语言：
install.packages("installr");
require(installr) #load / install+load installr updateR()
安装和卸载R：
http://cran.r-project.org/doc/manuals/r-release/R-admin.html#Uninstallation
http://cran.r-project.org/doc/manuals/r-release/R-admin.html#Installation
[root@centos64 R-3.1.1]# pwd
/home/xxx/R.3.1/R-3.1.1
[root@centos64 R-3.1.1]# make uninstall
https://www.r-project.org/
http://www.cnblogs.com/emanlee/p/5002380.html
注意：R的升级必须先卸载（make uninstall）再重新安装（下载/解压/configure/make/make install）