[jira] [Updated] (MAHOUT-1754) Distance and squared distance matrix routines

["Dmitriy Lyubimov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MAHOUT-1754?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dmitriy Lyubimov updated MAHOUT-1754:
-------------------------------------
    Description: 
R analogs: dist()

this issue suggests to provide routine for distance and squared distance matrix computation. 

Since most of the use actually requires or can use square distance routine, we suggest to provide both squared and non-squared eucledian distance matrices. 

By convention, distributed versions are prepended by (d) letter:

dist(x)
sqDist(x)
dsqDist

The points are assumed to be row-wise. 

We also provide variation for pair-wise distance matrix of two different inputs x and y: 

sqDist(x,y)
dsqDist(x,y).



> Distance and squared distance matrix routines
> ---------------------------------------------
>
>                 Key: MAHOUT-1754
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1754
>             Project: Mahout
>          Issue Type: Blog - New Blog Request
>            Reporter: Dmitriy Lyubimov
>             Fix For: 0.10.2
>
>
> R analogs: dist()
> this issue suggests to provide routine for distance and squared distance matrix computation. 
> Since most of the use actually requires or can use square distance routine, we suggest to provide both squared and non-squared eucledian distance matrices. 
> By convention, distributed versions are prepended by (d) letter:
> dist(x)
> sqDist(x)
> dsqDist
> The points are assumed to be row-wise. 
> We also provide variation for pair-wise distance matrix of two different inputs x and y: 
> sqDist(x,y)
> dsqDist(x,y).



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