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Posted to issues@lucene.apache.org by "Joel Bernstein (Jira)" <ji...@apache.org> on 2020/05/14 22:35:00 UTC
[jira] [Resolved] (SOLR-14478) Allow the diff Stream Evaluator to
operate on the rows of a matrix
[ https://issues.apache.org/jira/browse/SOLR-14478?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Joel Bernstein resolved SOLR-14478.
-----------------------------------
Resolution: Resolved
> Allow the diff Stream Evaluator to operate on the rows of a matrix
> ------------------------------------------------------------------
>
> Key: SOLR-14478
> URL: https://issues.apache.org/jira/browse/SOLR-14478
> Project: Solr
> Issue Type: New Feature
> Security Level: Public(Default Security Level. Issues are Public)
> Components: streaming expressions
> Reporter: Joel Bernstein
> Assignee: Joel Bernstein
> Priority: Major
> Fix For: 8.6
>
> Attachments: SOLR-14478.patch, Screen Shot 2020-05-14 at 8.54.07 AM.png
>
>
> Currently the *diff* function performs *serial differencing* on a numeric vector. This ticket will allow the diff function to perform serial differencing on all the rows of a *matrix*. This will make it easy to perform *correlations* on a matrix of *differenced time series vectors* using math expressions.
> A screen shot is attached with *diff* working on a matrix of time series data. The effect is powerful. It removes the trend from a matrix of time series vectors in one simple function call.
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