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Rでパッケージがインストールされてないときだけインストールする書き方を教えてください。

Last updated at Posted at 2012-12-26

今はこう書いてますが、他にいい方法ありませんか?

pkg.name <- "animation"

if(length(find.package(pkg.name, quiet=TRUE)) == 0) {
  install.packages(pkg.name)
}

追記:

if(!require("animation")){
  install.packages("animation")
}

これでできる。

pkg.name <- "animation"
if(!require(pkg.name, character.only=TRUE)){
  install.packages(pkg.name)
}

パッケージ名を変数にしたい場合には character.only=TRUE とする。

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