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https://issues.apache.org/jira/browse/SOLR-11789?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joel Bernstein resolved SOLR-11789.
-----------------------------------
    Resolution: Resolved

> Add integrate Stream Evaluator
> ------------------------------
>
>                 Key: SOLR-11789
>                 URL: https://issues.apache.org/jira/browse/SOLR-11789
>             Project: Solr
>          Issue Type: New Feature
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Joel Bernstein
>            Assignee: Joel Bernstein
>            Priority: Major
>             Fix For: 7.3
>
>         Attachments: SOLR-11789.patch, SOLR-11789.patch
>
>
> Now that we have *splines* and *derivatives* it makes sense to add 
> *integration*.  The *integrate* Stream Evaluator will perform a Romberg 
> Integration (https://en.wikipedia.org/wiki/Romberg%27s_method) given a spline 
> and min and max values.
> Implementation provided by Apache Commons Math.



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