October 2017
Intermediate to advanced
480 pages
9h 49m
Japanese
Content preview from Rではじめるデータサイエンス
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105
7
章
tibble
の
tibble
7.1
はじめに
本書では、Rの伝統的な
data.frame
の代わりに
tibble
を使います。
tibble
はデータフレームで
すが、古めかしい振る舞いを修正して容易に扱えるようになっています。Rの歴史は古く、10年な
いし20年前に使われていたことが、今では邪魔になることもあります。既存のコードが使えるよう
にR の基本部分を変更することは難しいので、ほとんどのイノベーションはパッケージで起こってい
ます。本章では
tibble
パッケージについて述べます。これは
tidyverse
での作業が楽になる頑固な
データフレームを提供します。ほとんどの箇所で、私はデータフレームと
tibble
を同じ意味で使い
ます。Rに組み込みのデータフレームに特に注意してもらいたい場合には、
data.frame
を使います。
tibble
についてさらに学びたいと思ったら、
vignette("tibble")
を実行するとよいでしょう。
7.1.1
準備するもの
本章では
tidyverse
の基本をなす
tibble
パッケージをさまざまな用途で使います。
library(tidyverse)
7.2
tibble
を作る
本書で使うほぼすべての関数が、
tidyverse
の統一形式
tibble
を作成します。他のRパッケージ
のほとんどは普通のデータフレームを使うので、データフレームを
tibble
に変換する必要がありま
す。データフレームから
as_tibble()
で変換できます。
as_tibble(iris)
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.