free_list[classno] = h;
Quadtrees are everywhere spatial data exists. Mapping services use quadtree-like tile pyramids to serve map tiles at different zoom levels (Bing's quadkey system, for example, addresses tiles as base-4 paths). Game engines use them for collision detection and visibility culling. Geographic information systems use spatial indexes to store and query spatial datasets. PostGIS uses GiST indexes (R-tree-style) for spatial queries on geometries, while PostgreSQL's core supports quadtree-like SP-GiST indexes for certain data types like points.，详情可参考heLLoword翻译官方下载
。关于这个话题，夫子提供了深入分析
Currently, only the macOS build has BLAS support as Win/Linux BLAS support is a rabbit hole that needs more time to investigate. On those platforms, numpy does win, but that won’t be the case for long! ↩︎
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Виктория Клабукова