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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12
1
章
ggplot2
によるデータ可視化
とがあります。そのときは、コンソールの左端を調べます。「
+
」だったら、Rは入力が完全な式では
なくて、入力完了を待っていることを表しています。この場合、Esc キーで現在の処理を強制終了し
て、普通は最初から簡単にもう一度やり直すことができます。
ggplot2
でグラフや図を作るときに、
+
をタイプする位置を間違えてしまう問題がよく起こります。
+
は行頭ではなく、行末でなければいけません。言い換えれば、次のようなコードの書き間違いをし
てはいけません。
ggplot(data = mpg)
+ geom_point(mapping = aes(x = displ, y = hwy))
まだ問題が解決しないのなら、ヘルプを試してみましょう。RStudioでは、どの R 関数でも、コン
ソールで「?関数名」を実行するか、（現在入力している行で）関数名を選択して F1キーを押せばヘル
プが表示されます。ヘルプがそれほど役立た
なくても心配する必要はありません。例が載っている
ところまでスキップし、自分の問題と合致するコードがないかを調べます。
それでもだめなら、エラーメッセージを注意して読み返します。答えが潜んでいることがよくあり
ます。Rにまだ慣れていないと、エラーメッセージに答えがあるのに、どう理解すべきかがわかって
いないことがあります。もう1 つの強力なツールは Google検索です。エラーメッセージの内容をそ
のまま入力して検索すると、既に他の誰かが同じ問題
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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.