forked from openkylin/mdds
127 lines
4.0 KiB
Markdown
127 lines
4.0 KiB
Markdown
Multi-Dimensional Data Structure (mdds)
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=======================================
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A collection of multi-dimensional data structure and indexing
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algorithm.
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Overview of data structures included in mdds
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--------------------------------------------
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This library implements the following data structures:
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* segment_tree
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* flat_segment_tree
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* point_quad_tree
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* multi_type_vector
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* multi_type_matrix
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* sorted_string_map
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* trie_map
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* packed_trie_map
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* rtree
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### Segment Tree
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Segment tree is a balanced-binary-tree based data structure efficient
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for detecting all intervals (or segments) that contain a given point.
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The segments may overlap with each other. The end points of stored
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segments are not inclusive, that is, when an interval spans from 2 to
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6, an arbitrary point x within that interval can take a value of 2 <=
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x < 6.
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### Flat Segment Tree
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Flat segment tree is a variant of segment tree that is designed to
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store a collection of non-overlapping segments. This structure is
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efficient when you need to store values associated with 1 dimensional
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segments that never overlap with each other. Like segment tree,
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stored segments' end points are non-inclusive.
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### Point Quad Tree
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Point quad tree stores 2-dimensional points and provides an efficient
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way to query all points within specified rectangular region.
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### Multi Type Vector
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Multi-type vector allows storage of unspecified number of types in a single
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logical array such that contiguous elements of identical type are stored in
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contiguous segment in memory space.
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### Multi Type Matrix
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Multi-type matrix is a matrix structure that allows storage of four different
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element types: numeric, string, boolean and empty. It uses multi-type vector as
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its underlying storage.
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### Sorted String Map
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Sorted string map is a simple data structure that takes a pre-sorted list of
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key-value pairs that are known at compile time, and allows efficient lookup.
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It does not allocate memory to duplicate its content, as it directly uses the
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pre-sorted list provided by the caller.
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### Trie Map
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Trie map is an associative container that stores multiple key-value pairs
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where keys are stored in a trie structure to optimize for prefix searches.
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### Packed Trie Map
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Packed trie map is nearly identical to the trie map counterpart except that
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this one is immutable. It packs all its content in a contiguous array for
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optimum storage and lookup efficiency. This implementation is based on the
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paper titled [Tightly Packed Tries: How to Fit Large Models into Memory, and Make them Load Fast, Too](https://www.aclweb.org/anthology/W09-1505/)
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by Ulrich Germann, Eric Joanis, and Samuel Larkin.
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### R-tree
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[R-tree](https://en.wikipedia.org/wiki/R-tree) is a tree-based data structure
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designed to store multi-dimensional geometric data with bounding boxes and
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provide optimal performance on region- or point-based queries. The one
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implemented in this library is a variant of R-tree known as
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[R*-tree](https://en.wikipedia.org/wiki/R*_tree).
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Documentation
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=============
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[Official API documentation](https://mdds.readthedocs.io/en/latest/) for general
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users of the library.
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Packages
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========
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Please see the [Releases](https://gitlab.com/mdds/mdds/-/releases) page for
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source package downloads.
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If you need old packages, please find them [here](OLD-DOWNLOADS.md).
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Installation
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============
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Please refer to the [CONTRIBUTING.md](CONTRIBUTING.md) file for build and
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installation instructions.
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License
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=======
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mdds is free software. You may copy, distribute, and modify it under
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the terms of the License contained in the file COPYING distributed
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with this package. This license is the same as the MIT/X Consortium
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license.
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Who uses mdds?
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==============
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These are the projects that are known to use mdds.
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* [LibreOffice](http://www.libreoffice.org)
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* [Calligra](https://www.calligra.org/)
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* [libetonyek](https://wiki.documentfoundation.org/DLP/Libraries/libetonyek)
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* [ixion](https://gitlab.com/ixion/ixion)
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* [orcus](https://gitlab.com/orcus/orcus)
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If you use mdds and would like your project to be included in the above list,
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please let us know.
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