不好意思，不太懂，library在哪里，怎么复制？我只在程序包下面看到有更新程序包，会弹出来已经安装的包。

library就是R安装路径下的文件夹，你找一找

期待有那种在线更新的功能

复制完library以后，怎样update呢、
在r中输入
update()吗？期待回复，谢谢

可以通过在其他目录下安装R ，再将旧版本保留
的library 目录下的文件拷贝至新版本library 目录下或卸载R ，把R 装到旧的目录下，最后使
用如下命令更新：
update.packages(checkBuilt=TRUE, ask=FALSE)
or
install.packages(.packages(all=TRUE))

参见刘思喆的《153分钟学会R》

《R语言实战》中也有描述

That's a matter of taste. For most people the best thing to do is to uninstall R (see the previous Q), install the new version, copy any installed packages to the library folder in the new installation, run update.packages(checkBuilt=TRUE, ask=FALSE) in the new R and then delete anything left of the old installation. Different versions of R are quite deliberately installed in parallel folders so you can keep old versions around if you wish.

For those with a personal library (folder R\win-library\x.y of your home directory, R\win64-library\x.y on 64-bit builds), you will need to update that too when the minor version of R changes (e.g. from 3.0.2 to 3.1.0). A simple way to do so is to copy (say) R\win-library\3.0 to R\win-library\3.1 before running update.packages(checkBuilt=TRUE, ask=FALSE).

谢谢分享