卸載使用中的R套件

開啟一個R以後，想要移除所有的變數可以下指令：

• rm(list = ls())

若是要卸載所有的套件，可以用下面的指令：

• lapply(paste('package:', names(sessionInfo()$otherPkgs), sep=""), detach, character.only=TRUE, unload=TRUE)

或是寫成一個function，方法如下：

detachAllPackages <- function() {
  basic.packages <- c("package:stats","package:graphics","package:grDevices","package:utils","package:datasets","package:methods","package:base")
  package.list <- search()[ifelse(unlist(gregexpr("package:",search()))==1,TRUE,FALSE)]
  package.list <- setdiff(package.list,basic.packages)
  if (length(package.list)>0)  for (package in package.list) detach(package, character.only=TRUE)
}
detachAllPackages()

參考資料：

• detach all packages while working in R：上面的指令都從這篇來的
  一行文的卸載方式由mmfrgmpds回應中提出
  函數的的卸載方式由mjaniec回應中提出

_EOF_