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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10.6
範囲クエリ
■
339
//
適切な範囲にするのはコストがかかりすぎる。計算に何の影響もないので、
//
そのままにしておく。
if (space.getLeft(dimension) < coord) {
if (below != null) { below.search(space, results); }
}
if (coord < space.getRight(dimension)) {
if (above != null) { above.search(space, results); }
}
}
例10-3は、木のすべての節点を訪問できるように修正した走査プログラムであ
る。
k-d
木は、
d
次元データセットを階層的に分割しているので、節点
n
で
範囲クエ
リ
は、次の
3
つの事項を決定する。
節点
n
に付随する領域は、
範囲クエリ
の中に完全に含まれるか。
この場合、すべての子孫点がクエリの結
果に属するので、
range
走査は停
止できる。
クエリ領域は、節点
n
に付随する点を含むか。
含まれる場合は、
n
に付随する点を結果集合に追加する。
節点
n
で表現される次元
d
に沿って、クエリ領域は
n
と交差するか。
2
つの場合がある。クエリ領域が
d
の左の点を探すなら、
n
の下の部分木
を走査する。クエリ領域が
d
の右の点を探すなら、
n
の上の部分木を走査
する。範囲
range
の
0
回、
1
回、または
2
回の再帰走査を行う。
返される結果が
KDSearchResults
オブジェクトであり、個別の点と部分木全体を
含むことに注意 ...
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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.