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From "Jeff Eastman (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAHOUT-65) Add Element Labels to Vectors and Matrices
Date Wed, 17 Jun 2009 17:22:07 GMT

    [ https://issues.apache.org/jira/browse/MAHOUT-65?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12720768#action_12720768
] 

Jeff Eastman commented on MAHOUT-65:
------------------------------------

Perhaps, though the Json representation of Sean's new SparseVector looks pretty dense. Realistic
element values would be larger than these test values, of course. A thousand double terms
will still add up:

{noformat}
Vec: {"class":"org.apache.mahout.matrix.SparseVector","vector":"{\"values\":{\"indices\":[0,1,2],\"values\":[1.0,2.0,3.0],\"numMappings\":3},\"cardinality\":3}"}
{noformat}

> Add Element Labels to Vectors and Matrices
> ------------------------------------------
>
>                 Key: MAHOUT-65
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-65
>             Project: Mahout
>          Issue Type: New Feature
>          Components: Matrix
>    Affects Versions: 0.1
>            Reporter: Jeff Eastman
>            Assignee: Jeff Eastman
>         Attachments: MAHOUT-65-name.patch, MAHOUT-65-name.patch, MAHOUT-65-name.patch,
MAHOUT-65.patch, MAHOUT-65b.patch, MAHOUT-65c.patch, MAHOUT-65d.patch
>
>
> Many applications can benefit by accessing elements in vectors and matrices using String
labels in addition to numeric indices. Investigate adding such a capability.

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