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From "Joel Bernstein (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-10682) Add variance Stream Evaluator
Date Sat, 13 May 2017 17:57:04 GMT

    [ https://issues.apache.org/jira/browse/SOLR-10682?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16009441#comment-16009441
] 

Joel Bernstein commented on SOLR-10682:
---------------------------------------

Apache Commons Math just expects double arrays, so at this point Stream Evaluators just transforms
any incoming data into double arrays.  So we would just have an "arrayMin", "arrayMax" method.


The vast majority of Stream Evaluators won't overlap with facet functions. I'll continue moving
forwards with functions that don't overlap until we figure out a plan for overlapping function
names.

[~dpgove], any thoughts on this?



 

> Add variance Stream Evaluator
> -----------------------------
>
>                 Key: SOLR-10682
>                 URL: https://issues.apache.org/jira/browse/SOLR-10682
>             Project: Solr
>          Issue Type: New Feature
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Joel Bernstein
>
> The variance Stream Evaluator will calculate the variance of a vector of numbers.
> {code}
> v = var(colA)
> {code}



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