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From "Dmitriy Lyubimov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAHOUT-1599) Add rand() operator to math-scala
Date Wed, 30 Jul 2014 00:32:38 GMT

    [ https://issues.apache.org/jira/browse/MAHOUT-1599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14078693#comment-14078693
] 

Dmitriy Lyubimov commented on MAHOUT-1599:
------------------------------------------

ah.sorry. there's no nonZero iterator on matrices, it seems, only on vectors. So one of (not
very efficient) corrections for the above i know of would be 



> Add rand() operator to math-scala
> ---------------------------------
>
>                 Key: MAHOUT-1599
>                 URL: https://issues.apache.org/jira/browse/MAHOUT-1599
>             Project: Mahout
>          Issue Type: Improvement
>          Components: Math
>    Affects Versions: 0.9
>            Reporter: Felix Schüler
>            Priority: Trivial
>              Labels: dsl, math, operator, random, scala
>         Attachments: MAHOUT-1599.patch
>
>
> I was looking at the scala-math operators and missed a rand(m, n) operator that generates
a m x n matrix filled with random numbers.
> I wanted random numbers from a uniform distribution over a specific interval so I implemented
a simple uniform random number generator.
> the rand(m, n, r) function takes any AbstractSamplerFunction and fills the matrix entries
with the numbers generated by its sample() method.



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