November 2019
Intermediate to advanced
472 pages
9h 23m
Japanese
Content preview from Rグラフィックスクックブック 第2版 ―ggplot2によるグラフ作成のレシピ集
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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.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.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.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.
375
15
章
データの前処理
データを図示する際にはプロットコマンドを呼び出す前にも苦労するポイントが多くあります。プ
ロット関数に渡す前に、データを読み込み正しい構造に変換しなければなりません。
R
が提供している
データセットはすぐに使える状態になっていますが、実世界のデータを扱う際にはそうはいきません。
視覚化する前にデータを整理して構造を整える必要があります。
この章のレシピはtidyverseのパッケージを多用します。
tidyverse
の簡単な背景については「1章 R
の基本」の導入部を参照してください。また、
R
の
base
パッケージを使って同じタスクの多くを実現す
る方法も示します。これは使用するパッケージ数を最小化することが重要な場合があるからです。ま
た
base
パッケージで書かれたコードを理解できると有益であるからです。
この章ではパイプ演算子とも呼ばれる
%>%
シンボルを広く使います。これに慣れていない場
合は「レシピ
1.7
%>%
で関数をつなぐパイプ演算子」を参照してください。
この章で使う
tidyverse
関数の多くは
dplyr
パッケージのものです。この章では
dplyr
パッケージが既
に読み込まれているものとして話を進めます。
tidyverse
は
library(tidyverse)
で読み込めます。実
行環境をよりスリムにしたければ
dplyr
を直接読み込むこともできます。
library(dplyr)
R
ではデータセットの保存先としてデータフレームが最もよく使われます。典型的には、各行が事例 ...
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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.