New sparse vector implementation: int[] indices; double[] values;
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Key: MATH-314
URL: https://issues.apache.org/jira/browse/MATH-314
Project: Commons Math
Issue Type: New Feature
Affects Versions: 2.0
Environment: all
Reporter: Jake Mannix
Priority: Minor
Fix For: 2.1
OpenMapRealVector is nice for fast random access, but if all you do with your
sparse vectors is dot them together, add them onto dense vectors, and so forth,
the representation as just an array of indices and an array of values is more
compact, and faster (for these operations).
It becomes prohibitive to do modification, however, so the usual thing is to
have them be immutable - use an OpenMapRealVector while modifing, then seal
them up into the constructor for an IntDoubleArrayVector form for fast
iteration and so forth.
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