June 2016
Beginner to intermediate
376 pages
8h 58m
Japanese
Content preview from データ分析によるネットワークセキュリティ
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6.5
可視化
125
sIP dIP sTime
3 10.0.0.3 65.164.242.247 2008/03/31T18:01:03.120
5 10.0.0.3 216.73.87.152 2008/03/31T18:01:03.220
6 10.0.0.3 216.73.87.152 2008/03/31T18:01:03.220
8 10.0.0.3 216.73.87.152 2008/03/31T18:01:03.430
このようにRのデータフレームは、アドホックな、テーブル1つだけのデータベースのように使う
ことができる。新しい列を追加することもできる。追加には、
$
演算子を使う。上記のNetFlowの記
録では、bytesにIPとTCPのヘッダ長まで含んだ値が含まれているので、以下では正味のデータ長
（payload）を計算し、新
たな列として追加している。
> #
ペイロード長を計算し、新たな列に加える。
IP
と
TCP
の通常のヘッダ長はそれぞれ
> # 20
バイトなので、
40
バイトをパケットの数だけトータルのバイト数から引く。
> #
これで新しいベクトルを生成して
payload_bytes
変数に代入する。
> payload_bytes <- s$bytes - (40 * s$packets)
> #
次に
payload_bytes
をデータフレームに追加する。
> s$payload_bytes <- payload_bytes
> #
うまく追加されたかどうかをチェックするため、最初の ...
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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.
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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.