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Date: Tue, 11 Feb 2014 12:10:19 +0000 (UTC)
From: "Till Rohrmann (JIRA)" <jira@apache.org>
To: dev@mahout.apache.org
Message-ID: <JIRA.12694475.1392119899181.23448.1392120619111@arcas>
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Subject: [jira] [Updated] (MAHOUT-1415) Clone method on sparse matrices
 fails if there is an empty row which has not been set explicitly
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     [ https://issues.apache.org/jira/browse/MAHOUT-1415?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Till Rohrmann updated MAHOUT-1415:
----------------------------------

    Attachment: MAHOUT-1415.patch

> 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
>            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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