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Date: Fri, 8 May 2009 02:33:45 -0700 (PDT)
From: "Samuel Guo (JIRA)" <jira@apache.org>
To: hama-dev@incubator.apache.org
Subject: [jira] Commented: (HAMA-170) Implementation of Matrix.Norm
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    [ https://issues.apache.org/jira/browse/HAMA-170?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12707290#action_12707290 ] 

Samuel Guo commented on HAMA-170:
---------------------------------

Edward, It seems that you mis-understand Norm-1 and Norm-inf.

'Norm-1' is simply the maximum absolute column sum of the matrix

'Norm-inf' is simply the maximum absolute row sum of the matrix

Plz check the wikipedia: http://en.wikipedia.org/wiki/Matrix_norm

> Implementation of Matrix.Norm
> -----------------------------
>
>                 Key: HAMA-170
>                 URL: https://issues.apache.org/jira/browse/HAMA-170
>             Project: Hama
>          Issue Type: Improvement
>          Components: implementation
>    Affects Versions: 0.1.0
>            Reporter: Edward J. Yoon
>            Assignee: Edward J. Yoon
>             Fix For: 0.1.0
>
>
>   enum Norm {
>     /** Maximum absolute row sum */
>     One,
>     /** The root of sum of the sum of squares */
>     Frobenius,
>     
>     /** Largest entry in absolute value */
>     Infinity,
>     
>     /** Largest entry in absolute value. Not a proper matrix norm  */
>     Maxvalue
>   }

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