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https://issues.apache.org/jira/browse/SPARK-18570?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15810250#comment-15810250
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Felix Cheung commented on SPARK-18570:
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Hi - the code is here:
https://github.com/apache/spark/blob/master/mllib/src/main/scala/org/apache/spark/ml/feature/RFormula.scala#L74
It would be great if you would start the discussion around what operators to
actually support. Thanks!
> Consider supporting other R formula operators
> ---------------------------------------------
>
> Key: SPARK-18570
> URL: https://issues.apache.org/jira/browse/SPARK-18570
> Project: Spark
> Issue Type: Sub-task
> Components: ML, SparkR
> Reporter: Felix Cheung
> Priority: Minor
>
> Such as
> {code}
> ∗
> X∗Y include these variables and the interactions between them
> ^
> (X + Z + W)^3 include these variables and all interactions up to three way
> |
> X | Z conditioning: include x given z
> {code}
> Other includes, %in%, ` (backtick)
> https://stat.ethz.ch/R-manual/R-devel/library/stats/html/formula.html
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