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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34
2
章 ワークフロー：基本
多数の代入をする際、何回も
<-
と入力するのは苦痛です。怠けて
=
を使うと動きはしますが後
で混乱するので、RStudioのショートカットの Alt-（Altを押しながら-）を使います
＊1
。その際、
RStudioは
<-
の前後に空白を配置します、これがよい書き方です。天気の良い日にコードを読むの
は惨めなものです。せめて目に休息を与えるために空白を使いましょう。
2.2
名前の中には何がある
?
オブジェクト名は英字から始まり、英字、数字、「
_
」と「
.
」を使うことができます。名前はわか
りやすくしたいので、複数の単語を組み合わせる書式が必要です。小文字の単語を「
_
」で結ぶ、
snake_case
という書式がお勧めです。
i_use_snake_case
otherPeopleUseCamelCase
some.people.use.periods
And_aFew.People_RENOUNCEconvention
コーディングスタイルについては 15 章でまた述べます。
名前を入力するとオブジェクトを調べられます。
x
#> [1] 12
次の代入を考えます。
this_is_a_really_long_name <- 2.5
このオブジェクトを調べるのに、RStudioの補完機能を試しましょう。
this
と入力しタブキーを押
し、正しいものが出てくるまで文字を入力し、Enterキーを押します。
おや間違えた。
this_is_a_really_long_name
は2.5ではなく3.5にす
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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.