December 2016
Intermediate to advanced
440 pages
9h 44m
Japanese
Content preview from アルゴリズムクイックリファレンス 第2版
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40
■
3
章 アルゴリズムの構成要素
search(A, 15)
見つかった要素
探索済み要素
未探索要素
図3-1 逐次探索実行の例
3.3
評価実験の形式
各アルゴリズムの性能を、そのアルゴリズムに適した一連のベンチマーク問題の
実行で確認する。本書の付録
A
では、時間計測に使われたメカニズムの詳細を述べ
る。性能を適切に評価するため、テストスイートを
k
個（普通は
k
≧
10
）の個別試行
で構成する。最良と最悪の
2
つの結果は外れ値として棄却し、残った
k
−
2
回の試
行結果を集約して、その平均と標準偏差を計算する。性能表は、
n
＝
2
から
2
20
まで
の範囲のサイズの問題インスタンスについて示す。
3.4
浮動小数点計算
本書のアルゴリズムの中には数値計算が含まれるので、最近のコンピュータの数
値計算処理の能力と限界を述べる必要がある。コンピュータでは、レジスタに貯え
た値に対して中央演算
装置（
CPU
）が基本演算を実行する。レジスタのサイズは、
コンピュータアーキテクチャが、
1970
年代に普及していた
8
ビット
Intel
プロセッ
サから、今日広く採用されている
64
ビットアーキテクチャ（
Intel
の
Itanium
や
Sun
Microsystems
の
SPARC
など）へと進化するにつれて大きくなってきた。
CPU
は、
レジスタ上の整数値に対して、
ADD
、
MULT
、
DIVIDE
、
SUB
などの基本演算を
行う。浮動小数点演算処理装置（
FPU
）は、
2
進浮動小数点算術演算に関する
IEEE
標準（
IEEE 754
）に従って、浮動小数
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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.