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https://issues.apache.org/jira/browse/HAMA-174?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Edward J. Yoon updated HAMA-174:
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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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