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https://issues.apache.org/jira/browse/MAHOUT-756?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13063774#comment-13063774
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Sean Owen commented on MAHOUT-756:
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UnsupportedOperationException can't be right -- this operation is supportable.
@Ted: yes it doesn't seem right to use DenseVector; that's what it does now
though. The way out is probably to add a like(int) method to Vector.
I agree that there are several potential additional issues with this class
(like exceptions on access).
Here's the kicker: nothing uses this class. Given this thread alone I'd suggest
it's better to remove it and start again later if desired.
> VectorList (Matrix implementation) does not maintain cardinality getters
> correctly
> ----------------------------------------------------------------------------------
>
> Key: MAHOUT-756
> URL: https://issues.apache.org/jira/browse/MAHOUT-756
> Project: Mahout
> Issue Type: Bug
> Components: Math
> Reporter: Lance Norskog
> Priority: Minor
> Attachments: VectorList.patch
>
>
> VectorList (implements Matrix) is dynamically expandable, row-wise. There are
> three different ways to query the size of a Matrix, and VectorList does not
> correctly supply these values.
>
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