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From "Luc Maisonobe (JIRA)" <>
Subject [jira] Resolved: (MATH-314) New sparse vector implementation: int[] indices; double[] values;
Date Mon, 25 Jan 2010 21:41:35 GMT


Luc Maisonobe resolved MATH-314.

    Resolution: Later

Closing problem for now as issuer doesn't need this feature anymore and as there are other
sparse implementation available in commons-math for general use.
Will be implemented later if someone else asks again for it.

> New sparse vector implementation: int[] indices; double[] values;
> -----------------------------------------------------------------
>                 Key: MATH-314
>                 URL:
>             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
> 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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