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From "Edward J. Yoon (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HAMA-174) Compute the transpose of a matrix
Date Tue, 21 Apr 2009 03:00:47 GMT

     [ https://issues.apache.org/jira/browse/HAMA-174?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Edward J. Yoon updated HAMA-174:
--------------------------------

    Attachment: HAMA-174.patch

Here's my patch.

> 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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