1. 加载包
> library(lattice)
> dotplot(variety ~ yield|site,data=barley,groups=year)
Immer's barley 数据集点状图
2. 使用search函数查看所有已加载了的包
> search()
[1] ".GlobalEnv" "package:lattice"
[3] "tools:rstudio" "package:stats"
[5] "package:graphics" "package:grDevices"
[7] "package:utils" "package:datasets"
[9] "package:methods" "Autoloads"
[11] "package:base"
> View(install.packages())
Error in install.packages : argument "pkgs" is missing, with no default
> View(installed.packages())