Github user elbamos commented on the pull request:
https://github.com/apache/incubator-zeppelin/pull/208#issuecomment-187961103
@jeffsteinmetz Thanks for your comment. By default, `r` and `knitr` are in
the `spark` interpreter group, so Zeppelin lets them be called by
`%r`/`%spark.r` or `%knitr`/`%spark.knitr` as equivalents, respectively. I've
put in a note in the documentation to clarify.
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