R语言【base】——使用library判断是否已经安装第三方软件包:library(package, logical.return=TRUE)
Packagebaseversion4.3.2Parameterslibrary(package,help,pos=2,lib.loc=NULL,character.only=FALSE,logical.return=FALSE,warn.conflicts,quietly=FALSE,verbose=getOption("verbose"),mask.ok,exclude,include.onl