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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HAMA-174) Compute the transpose of a matrix
Date Tue, 21 Apr 2009 03:25:47 GMT

    [ https://issues.apache.org/jira/browse/HAMA-174?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12701034#action_12701034
] 

Hudson commented on HAMA-174:
-----------------------------

+1 overall.  Here are the results of testing the latest attachment 
http://issues.apache.org/jira/secure/attachment/12405983/HAMA-174.patch
against trunk revision 766595.

    @author +1.  The patch does not contain any @author tags.

    tests included +1.  The patch appears to include 6 new or modified tests.

    javadoc +1.  The javadoc tool did not generate any warning messages.

    javac +1.  The applied patch does not generate any new javac compiler warnings.

    release audit +1.  The applied patch does not generate any new release audit warnings.

    findbugs +1.  The patch does not introduce any new Findbugs warnings.

    core tests +1.  The patch passed core unit tests.

Test results: http://hudson.zones.apache.org/hudson/job/Hama-Patch/170/testReport/
Findbugs warnings: http://hudson.zones.apache.org/hudson/job/Hama-Patch/170/artifact/trunk/build/reports/findbugs/newPatchFindbugsWarnings.html
Checkstyle results: http://hudson.zones.apache.org/hudson/job/Hama-Patch/170/artifact/trunk/build/test/checkstyle-errors.html
Console output: http://hudson.zones.apache.org/hudson/job/Hama-Patch/170/console

This message is automatically generated.

> Compute the transpose of a matrix
> ---------------------------------
>
>                 Key: HAMA-174
>                 URL: https://issues.apache.org/jira/browse/HAMA-174
>             Project: Hama
>          Issue Type: Improvement
>          Components: implementation, mapred 
>    Affects Versions: 0.1.0
>            Reporter: Edward J. Yoon
>            Assignee: Edward J. Yoon
>             Fix For: 0.1.0
>
>         Attachments: HAMA-174.patch
>
>
> The transpose of a matrix is another matrix in which the rows and columns have been reversed.
The matrix must be square for this work.
> | a11 a12 a13 |    | a11 a21 a31 |
> | a21 a22 a23 | => | a12 a22 a32 |
> | a31 a32 a33 |    | a13 a23 a33 |
> - A map task receives a row n as a key, and vector of each row as its value
>  - emit (Reversed index, the entry with the given index)
> ex) row = 1, { 1: a11, 2: a12, 3: a13 }
> a11, a11
> a21, a12
> a31, a13
> ...
> - Reduce task sets the reversed values

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