November 2019
Intermediate to advanced
472 pages
9h 23m
Japanese
Content preview from Rグラフィックスクックブック 第2版 ―ggplot2によるグラフ作成のレシピ集
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レシピ
14.2
SVG
ベクタファイルへの出力
361
また、
PDF
ファイルは
PNG
ファイルなどのビットマップファイルより一般的にサイズが小さくなりま
す。ピクセルごとの色情報ではなく、「ここからあそこまで線を引く」といった描画命令の集合を使って
いるからです。しかしビットマップのほうが小さくなることもあります。例えば、点が幾重にも重なっ
た散布図では、
PDF
ファイルは
PNG
ファイルよりとても大きくなることがあります。ほとんどの点は覆
い隠されているにも関わらず、
PDF
ファイルはすべての点を描く命令を含んでるからです。一方でビッ
トマップファイルは冗長な情報を含みません。「レシピ5.5 オーバープロットを扱う」の例を参照して
ください。
関連項目
PDF
や
SVG
ファイルを手動で編集したいときは「レシピ14.4 ベクタファイルの編集」を参照してく
ださい。
レシピ
14.2
SVG
ベクタファイルへの出力
問題
図をスケーラブル・ベクタ・グラフィックス（
SVG
）画像に保存したい。
解決策
svglite
パッケージの
svglite()
を使います。
library(svglite)
svglite("myplot.svg", width = 4, height = 4)
plot(...)
dev.off()
# ggsave()
を使う場合
ggsave("myplot.svg", width = 8, height = 8, units = "cm")
解説
R
には
SVG
出力を生成する組み込みの
svg()
関数がありますが、
svgl
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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.