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https://issues.apache.org/jira/browse/MAHOUT-756?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13063705#comment-13063705
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Lance Norskog commented on MAHOUT-756:
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When it is this confusing, UnsupportedOperationException is permissible. There
is no obvious right thing to do. What if there are different Vector classes and
some empty slots?
Using DenseVector/Matrix is the default policy in other places, so let's go
with that. If your program runs out of memory, you'll eventually find all of
the DenseVectors and track down the problem. In the meantime, it will be slow
but will work.
> 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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