[jira] [Commented] (TINKERPOP-2487) Add steps to support basic analysis like standard deviation and percentile

["Kelvin R. Lawrence (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/TINKERPOP-2487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17246736#comment-17246736 ] 

Kelvin R. Lawrence commented on TINKERPOP-2487:
-----------------------------------------------

I have recently had two different users ask me if we have considered a `product` step also that would multiply all the values in the stream together. There is no easy workaround today outside of using lambdas/closures.

> Add steps to support basic analysis like standard deviation and percentile
> --------------------------------------------------------------------------
>
>                 Key: TINKERPOP-2487
>                 URL: https://issues.apache.org/jira/browse/TINKERPOP-2487
>             Project: TinkerPop
>          Issue Type: Improvement
>          Components: process
>    Affects Versions: 3.4.8
>            Reporter: Guo Junshi
>            Priority: Minor
>
> When using tinkerpop Gremlin for real use cases, we found that some general analytical steps are very useful, yet not supported now. Some analytical steps are general enough to be part of the official gremlin package, e.g. steps to calculate standard deviation and percentile. The example usage might be:
>  
> {code:java}
> gremlin> g.V().values('ages')
> ==>1
> ==>2
> ==>3
> gremlin> g.V().values('ages').stdev()
> ==>0.816
> gremlin> g.V().values('ages').fold().stdev(Scope.local)
> ==>0.816
> gremlin> g.V().values('ages').percentile(50)
> ==>2
> // one percentile, return single value
> gremlin> g.V().values('ages').percentile(0, 100)
> ==>[0: 1, 100: 3]
> // multiple percentiles, return a map{code}
> These steps are frequently used in our cases, and we think it would be great to support them in official versions. 
>  
>  



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