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Posted to dev@mahout.apache.org by "Dmitriy Lyubimov (JIRA)" <ji...@apache.org> on 2015/06/17 21:01:00 UTC

[jira] [Resolved] (MAHOUT-1725) elementwise power operator ^

     [ https://issues.apache.org/jira/browse/MAHOUT-1725?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Dmitriy Lyubimov resolved MAHOUT-1725.
--------------------------------------
    Resolution: Fixed

> elementwise power operator ^
> ----------------------------
>
>                 Key: MAHOUT-1725
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1725
>             Project: Mahout
>          Issue Type: Improvement
>            Reporter: Dmitriy Lyubimov
>            Assignee: Dmitriy Lyubimov
>             Fix For: 0.10.2
>
>
> this is a power elementwise operation on in-core and out-of-core tensor types. it is only defined on (tensor-type, Double) pair. This is consistent with R caret operator. 
> e.g. computing distance between two points(vectors) x and y:
>         sqrt((x-y) ^= 2 sum)
> Danger is that for integral types in Scala interpret this as exclusive or, which is something completely different altogether .



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