[jira] [Commented] (SPARK-18569) Support R formula arithmetic

["Joseph K. Bradley (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-18569?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16314994#comment-16314994 ] 

Joseph K. Bradley commented on SPARK-18569:
-------------------------------------------

[~felixcheung] There are a few JIRAs for R still targeted for 2.3.  Would you mind vetting them to see which should be retargeted for 2.4 vs. un-targeted?  Thanks!

> 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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