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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21.4
コードチャンク
383
●
スクリプトエディタの左下のドロップダウンコードナビゲータで、簡単に必要なチャンクにナビ
ゲーションできる。
●
チャンクで作られたグラフに他でも使える名前が付けられる。「22.7.2 他の重要なオプション」
でさらに学ぶ。
●
実行のたびにコストの高い再計算をしなくて済むようにキャッシュしたチャンクのネットワーク
を設定できる。それについてはこの後でさらに学ぶ。
特別な振る舞いをするチャンク名
setup
があります。ノートブックモードのとき、
setup
というチャ
ンクは、他のコードを実行する前に一度だけ自動実行されます。
21.4.2
チャンクオプション
チャンクの出力は、チャンクヘッダに与えられるオプション引数でカスタム化できます。
knitr
に
は、コードチャンクのカスタム化に使える約60のオプションが用意されています。よく使う重要な
チャンクオプションだけをここで述べます。全部については、https://yihui.name/knitr/options/で
一覧できます。
最も重要なオプションは、コードブロックの実
行を制御し、最終レポートに結果をどのように挿入
するかを指定します。
eval = FALSE
コードの実行は行わない（当然、結果も生成されない）。これは、コード例を表示したり、大
きなコードブロックの実行をコメントアウトしないで実行したくないときに役立つ。
include = FALSE
コードは実行するが、最終文書にコードも結果も含めない。これは
setup
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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.