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https://issues.apache.org/jira/browse/MAHOUT-531?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12924369#action_12924369
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Ted Dunning commented on MAHOUT-531:
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For a dense matrix, you should just assume that all values are non-zero.
getNNZE should be the same as rowSize() * colSize() and iterateNZ should be
iterator.
The point is that the serialized representation of a dense matrix should be
smaller and faster if indexes are not stored.
> MatrixWritable doesn't actually write/read anything
> ---------------------------------------------------
>
> Key: MAHOUT-531
> URL: https://issues.apache.org/jira/browse/MAHOUT-531
> Project: Mahout
> Issue Type: Bug
> Components: Math
> Reporter: Alexander Hans
> Attachments: MAHOUT-531.patch
>
>
> The write() and readFields() methods of MatrixWritable write/read only the
> classname, they don't write/read actual data.
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