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R > データ構造 > データフレーム > 構造確認 > str()

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

str()で構造が分かるようだ。

> o<-data.frame(w<-0:2, x<-1:3, y<-3:1, z<-5:3)
> nrow(o)
[1] 3
> ncol(o)
[1] 4
> o
  w....0.2 x....1.3 y....3.1 z....5.3
1        0        1        3        5
2        1        2        2        4
3        2        3        1        3
> str(o)
'data.frame':	3 obs. of  4 variables:
 $ w....0.2: int  0 1 2
 $ x....1.3: int  1 2 3
 $ y....3.1: int  3 2 1
 $ z....5.3: int  5 4 3
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