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R > which(x %in% c("zun","doko")) > 要素が"zun"か"doko"であるものを探す

Last updated at Posted at 2016-09-22
動作環境
RStudio 0.99.903 on Windows 7 pro
R version 3.3.1 

R機能マップ http://qiita.com/7of9/items/0f911bcb95d3a8bbd703

参考 Rで学ぶデータ・プログラミング入門 by 石田基広さん

%in%を使って、複数の要素のいずれかに対応するか確認できるようだ。

例題を考えてみた。

> x<-c("zun","doko","hoi")
> which(x %in% c("zun","doko"))
[1] 1 2

要素1と2が見つかる。

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