commons-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Luc Maisonobe (JIRA)" <>
Subject [jira] Commented: (MATH-314) New sparse vector implementation: int[] indices; double[] values;
Date Sun, 27 Dec 2009 20:08:29 GMT


Luc Maisonobe commented on MATH-314:

As MATH-312 as been resolved recently, could you provide the patch you told us about ?

> 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.

This message is automatically generated by JIRA.
You can reply to this email to add a comment to the issue online.

View raw message