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https://issues.apache.org/jira/browse/MATH-314?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12804223#action_12804223
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Luc Maisonobe commented on MATH-314:
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I don't remember the status of this issue yet.
Jake, did you provide another patch that I again forgot to apply ?
> New sparse vector implementation: int[] indices; double[] values;
> -----------------------------------------------------------------
>
> 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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