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AGlassman

Radix Patricia Tree

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AGlassman

Does anyone know of a native AutoIt implementation of Patricia Radix Trees (http://en.wikipedia.org/wiki/Radix_tree)? Or an external implementation that could be interfaced to AutoIt? A search of the forums turns up nothing.

I need an in-memory data structure that can search a large number of long strings that have a (relativly) small number of common prefixes. Insert/Delete times are not that critical for this project, only search speed and memory usage. While there are many versions of associative arrays that might do what I need, none seem to have the combination of speed and compactness that a Patricia Tree might offer. I have started work on my own design, but I certainly don't want to re-invent the wheel.

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jchd

You may want to consider loading your data as an SQLite in-memory database and then enjoy the power of SQL and built-in functions to query the table(s). A full text search is also available (FTS3) as a standard feature, albeit word-oriented rather than prefix-oriented. In case you need some special search function, writing an ad-hoc extension is fairly easy in most cases.

Comparing the speed of some AutoIt-based Radix-tree implementation with SQLite query using the right index should be favorable to the latter.

You can give it a try in surprisingly few lines of standard AutoIt code, just to keep sure you don't miss an opportunity to keep things simple.


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RegExp tutorial: enough to get started
PCRE v8.33 regexp documentation latest available release and currently implemented in AutoIt beta.

SQLitespeed is another feature-rich premier SQLite manager (includes import/export). Well worth a try.
SQLite Expert (freeware Personal Edition or payware Pro version) is a very useful SQLite database manager.
An excellent eBook covering almost every aspect of SQLite3: a must-read for anyone doing serious work.
SQL tutorial (covers "generic" SQL, but most of it applies to SQLite as well)
A work-in-progress SQLite3 tutorial. Don't miss other LxyzTHW pages!
SQLite official website with full documentation (may be newer than the SQLite library that comes standard with AutoIt)

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