November 2017
Intermediate to advanced
328 pages
6h 51m
Japanese
Content preview from 入門 PySpark ―PythonとJupyterで活用するSpark 2エコシステム
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138
7
章
GraphFrames
の合計遅延時間が最も大きいのはカリフォルニアです。
7.6
頂点の次数
グラフ理論においては、頂点の次数はその頂点に付いている辺の数と定義されています。本章のフラ
イトのサンプルデータの場合、この次数は頂点（すなわち空港）に付いている辺の（すなわちフライト）
の総数ということになります。したがって、このグラフから（降順で）上位 20 の次数の頂点を取得すれ
ば 、そ れ は 上 位 20 の最も多忙な（すなわち行き来するフライトの多い）空港を調べることになります。
これは、次のクエリですぐにわかります。
display(tripGraph.degrees.sort(desc("degree")).limit(20))
ここでは
display
コマンドを使っているので、このデータはすぐに棒グラフとして表示できます。
7.6
頂点の次数
139
さらに深く調べて、
inDegrees
（すなわち到着便）の上位20を見てみましょう。
display(tripGraph.inDegrees.sort(desc("inDegree")).limit(20))
outDegrees
（すなわち出発便）の上位 20は次のようになります。
display(tripGraph.outDegrees.sort(desc("outDegree")).limit(20)) ...
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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.