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https://issues.apache.org/jira/browse/MAHOUT-1415?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sebastian Schelter resolved MAHOUT-1415.
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Resolution: Fixed
fixed, thank you Till!
> Clone method on sparse matrices fails if there is an empty row which has not
> been set explicitly
> ------------------------------------------------------------------------------------------------
>
> Key: MAHOUT-1415
> URL: https://issues.apache.org/jira/browse/MAHOUT-1415
> Project: Mahout
> Issue Type: Bug
> Components: Math
> Affects Versions: 1.0
> Environment: Mac OS X Mavericks, Darwin Kernel Version 13.0.2
> Reporter: Till Rohrmann
> Assignee: Sebastian Schelter
> Priority: Minor
> Labels: newbie
> Fix For: 1.0
>
> Attachments: MAHOUT-1415.patch
>
> Original Estimate: 10m
> Remaining Estimate: 10m
>
> The clone method of the SparseMatrix class fails with a NullPointerException
> if there exists an empty row in the matrix which has not been explicitly set.
> The reason for this problem is that the clone operation iterates over all
> rows and clones them whether there exists a Vector instance for this row or
> not. The problem should be easily fixed by iterating only over the existing
> matrix slices.
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