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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8.4
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parse_date("01/02/15", "%y/%m/%d")
#> [1] "2001-02-15"
非英語の月名に
%b
または
%B
を使う場合は、
locale()
に
lang
引数を設定する必要があります。
date_names_langs()
で組み込み言語の一覧を確かめるか、言語が含まれていない場合には、
date_
names()
で作成します。
parse_date("1 janvier 2015", "%d %B %Y", locale = locale("fr"))
#> [1] "2015-01-01"
1.
locale()
で最も重要な引数は何か。
2.
decimal_mark
と
grouping_mark
を同じ文字に設定しようとすると何が起こるか。
decimal_mark
を
「
,
」
に設定すると、
grouping_mark
のデフォルト値に何が起こるか。
grouping_mark
を
「
.
」
に
設定すると
decimal_mark
のデフォルト値に何が起こるか。
3.
locale()
の
date_format
と
time_format
オプションについて何も論じなかった。これらは何を
するか。これらが役立つ場合を示す例を作りなさい。
4. 米国以外に住んでいるなら、一番よく読み込むファイルの種類に対する設定をカプセル化する
新たなロケールオブジェクトを作りなさい。
5.
read_csv()
と
read_csv2()
との相違は何か。
6. ヨーロッパで一番よく用いられている符号化方式は何か。ア ...
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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.