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Date: Mon, 8 Oct 2012 21:44:02 +0000 (UTC)
From: "Paritosh Ranjan (JIRA)" <jira@apache.org>
To: dev@mahout.apache.org
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Subject: [jira] [Updated] (MAHOUT-1091) Bug in SequentialAccessSparseVector
 full iteration
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     [ https://issues.apache.org/jira/browse/MAHOUT-1091?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Paritosh Ranjan updated MAHOUT-1091:
------------------------------------

    Attachment: MAHOUT-1091.patch

Just tried out of curiosity. The patch contains the fix and a junit test demonstrating the fix. 

The math module's test cases pass after this fix. Have not checked the complete build yet. 
                
> Bug in SequentialAccessSparseVector full iteration
> --------------------------------------------------
>
>                 Key: MAHOUT-1091
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1091
>             Project: Mahout
>          Issue Type: Bug
>          Components: Math
>            Reporter: Ted Dunning
>             Fix For: 0.8
>
>         Attachments: MAHOUT-1091.patch
>
>
> The iterator for the SequentialAccessSparseVector doesn't return any items beyond the last non-zero.  This breaks some stuff pretty massively, but hopefully doesn't break much user code since iterating through all elements of a sparse vector is a relatively rare thing to do.

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