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Posted to issues@solr.apache.org by "Joel Bernstein (Jira)" <ji...@apache.org> on 2022/01/27 14:45:00 UTC

[jira] [Resolved] (SOLR-13776) Allow derivatives to be computed for derivatives

     [ https://issues.apache.org/jira/browse/SOLR-13776?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Joel Bernstein resolved SOLR-13776.
-----------------------------------
    Resolution: Fixed

This is supported as shown by the docs:

https://solr.apache.org/guide/8_11/numerical-analysis.html#the-second-derivative-acceleration

> Allow derivatives to be computed for derivatives
> ------------------------------------------------
>
>                 Key: SOLR-13776
>                 URL: https://issues.apache.org/jira/browse/SOLR-13776
>             Project: Solr
>          Issue Type: Improvement
>          Components: streaming expressions
>            Reporter: Joel Bernstein
>            Assignee: Joel Bernstein
>            Priority: Minor
>
> The *derivative* Stream Evaluator operates over functions (spline, lerp, akima, loess, polyfit, oscillate etc...), but does not work with the function returned by the derivative function itself. This means a spline needs to be wrapped around the derivative to take a second derivative. This ticket will allow the derivative function to be applied directly to output of the derivative function, by internally wrapping a spline around derivative function that was passed in.



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