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https://issues.apache.org/jira/browse/SPARK-18569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15827021#comment-15827021
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Joseph K. Bradley commented on SPARK-18569:
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+1 for putting together a design doc for RFormula to help us consider these
edge cases and decide on priorities for adding functionality. [~felixcheung]
do you want to shepherd this for 2.2, or shall I remove the target?
> Support R formula arithmetic
> -----------------------------
>
> Key: SPARK-18569
> URL: https://issues.apache.org/jira/browse/SPARK-18569
> Project: Spark
> Issue Type: Sub-task
> Components: ML, SparkR
> Reporter: Felix Cheung
>
> I think we should support arithmetic which makes it a lot more convenient to
> build model. Something like
> {code}
> log(y) ~ a + log(x)
> {code}
> And to avoid resolution confusions we should support the I() operator:
> {code}
> I
> I(X∗Z) as is: include a new variable consisting of these variables multiplied
> {code}
> Such that this works:
> {code}
> y ~ a + I(b+c)
> {code}
> the term b+c is to be interpreted as the sum of b and c.
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