November 2018
Intermediate to advanced
272 pages
6h 51m
Japanese
book
エレガントなSciPy ―Pythonによる科学技術計算
by Juan Nunez-Iglesias, Stéfan van der Walt, Harriet Dashnow, 山崎 邦子, 山崎 康宏
Content preview from エレガントなSciPy ―Pythonによる科学技術計算
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66
3 章 ndimage を使った画像領域のネットワーク
3.4.2
演習：ソーベル勾配の大きさ
先ほど、水平と垂直のソーベルフィルタという
2
つの異なるフィルタを組み合わせる方法を紹
介しました。
ndi.generic_filter
を使って、これを
1
回で実行する関数を書いてみましょう。
「
A.3
解答：ソーベル勾配の大きさ」を確認してみましょう。
3.5
グラフと
NetworkX
ライブラリ
グラフは、驚くほど多様なデータを自然に表現するものです。例えば、ウェブ上のページはノー
ドを構成することができ、ページ間のリンクも、やはり、リンクになることができます。
1
章や
2
章で扱ったような生物学の分野では、いわゆる転写ネットワークが遺伝子を表現するノードを持
ち、互いの発現に影響を及ぼす遺伝子同士をエッジで結合します。
グラフとネットワーク
この文脈では、「グラフ」は「ネットワーク」と同義語であり、「プロット」とは別物です。数学者と
コンピュータ科学者は、これらを議論するのに少々異なる用語を用いてきました。グラフ＝ネット
ワーク、頂点＝ノード、エッジ（または辺）＝リンク＝弧、です。本章でもその伝統を受け継ぎ、こ
れらの用語を同じ意味で用います。
本書を手にした読者のみなさんは、ネットワーク用語の方に馴染みがあるかもしれませんね。つま
り、1 つの「ネットワーク」は、ノードと、ノード間のリンクで構成されます。同様に、1 つの「グ
ラフ」は、頂点と、頂点間のエッジで構成されます。NetworkX には、
nodes
とノード間の ...
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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.