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https://issues.apache.org/jira/browse/MAHOUT-268?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jake Mannix reassigned MAHOUT-268:
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Assignee: Jake Mannix
> Vector.getDistanceSquared() is incorrect for both SparseVector varieties
> ------------------------------------------------------------------------
>
> Key: MAHOUT-268
> URL: https://issues.apache.org/jira/browse/MAHOUT-268
> Project: Mahout
> Issue Type: Bug
> Affects Versions: 0.2
> Environment: all
> Reporter: Jake Mannix
> Assignee: Jake Mannix
> Fix For: 0.3
>
>
> I'm pretty sure that getDistanceSquared() should just return as if an
> optimized implementation of:
> {code}
> public double getDistanceSquared(Vector v) { return
> this.minus(v).getLengthSquared(); }
> {code}
> In which case if some vector elements are negative, both
> SequentialAccessSparseVector (my fault!) and RandomAccessSparseVector return
> the wrong thing. Very easy to write a failing unit test for this one.
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