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
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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.
232
14
章
magrittr
でパイプ
●
デバッグが面倒です。間違いがあったら、パイプラインを始めからやり直さねばならない。
●
変換されるオブジェクトを繰り返す（
foo_foo
を6回書き替える）ために、行ごとに何が変わった
かがわかりにくい。
14.2.3
関数作成
代入を止めて関数呼び出しを連結するという別の方法もあります。
bop(
scoop(
hop(foo_foo, through = forest),
up = field_mice
),
on = head
)
この場合の欠点は、内から外へ、右から左へと読まねばならず、引数が離れた位置となる
（Dagwoodサンドイッチ（https://en.wikipedia.org/wiki/Dagwood_sandwich）問題と呼ばれる）こと
です。要するに、このコードは人間にはわかりにくいものです。
14.2.4
パイプを使う
最後になりますが、パイプを使うことができます。
foo_foo %>%
hop(through = forest) %>%
scoop(up = field_mouse) %>%
bop(on = head)
これは、名詞ではなく動詞に焦点を当てるので、私の大好きな形式です。動作命令の集合として
この関数構成列を読むことができます。Foo Fooは、飛び跳ねて、追い出して、ぶったたいた。もち
ろん、欠点はパイプをよく知っておく必要があることです。
%>%
を一度も見たことがないと、このコー
ドが何をするかまったくわから
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.