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https://issues.apache.org/jira/browse/SPARK-18569?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen updated SPARK-18569:
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Affects Version/s: 2.4.3
Issue Type: Improvement (was: Sub-task)
Parent: (was: SPARK-15540)
> Support R formula arithmetic
> -----------------------------
>
> Key: SPARK-18569
> URL: https://issues.apache.org/jira/browse/SPARK-18569
> Project: Spark
> Issue Type: Improvement
> Components: ML, SparkR
> Affects Versions: 2.4.3
> Reporter: Felix Cheung
> Priority: Major
>
> 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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