[ https://issues.apache.org/jira/browse/SOLR-10590?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Joel Bernstein updated SOLR-10590: ---------------------------------- Fix Version/s: master (7.0) > Add Cross Correlation Stream Evaluator > -------------------------------------- > > Key: SOLR-10590 > URL: https://issues.apache.org/jira/browse/SOLR-10590 > Project: Solr > Issue Type: New Feature > Security Level: Public(Default Security Level. Issues are Public) > Reporter: Joel Bernstein > Fix For: master (7.0) > > > Now that we have basic correlation (SOLR-10582) implemented we can use it at > as a basis for cross correlation. Apache commons math apparently does not > have a cross correlation implementation, so it will need to be implemented. > The basic approach taken will be to slide columnA along columnB and perform > the correlation calculation until correlation is either 1.0 or max lag has > been reached. > Both *auto-correlation* and *auto-regression* can be built on top the > cross-collation function. > If anyone has an alternative more efficient approach or knows of an existing > implementation that can be plugged in, please let me know. > Syntax: > {code} > let(a=expr, > b=expr, > c=col(a, fieldName), > d=col(b, fieldName), > tuple(corr=xcorr(c,d,10))) > {code} -- This message was sent by Atlassian JIRA (v6.3.15#6346) --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org