问题
I am working on a machine that has older version of R. I don't have root access on the machine, and the sys admin is on a vacation.
So the question I have is, how can I install and manage (the packages, especially) the latest version of R? Obviously I need to download the R package and install it, but a few detailed instructions from the community will help.
R noob here. Help will be greatly appreciated. Thanks
来源：https://stackoverflow.com/questions/10824440/how-to-install-and-manage-multiple-versions-of-r