That's a good point. My usage of R is quite a lot more recent than S, or even the original advent of R. I know that R originally built on an open source Scheme

That's a good point. My usage of R is quite a lot more recent than S, or even the original advent of R. I know that R originally built on an open source Scheme runtime, but in so doing, I don't know how much influence that had on the evolution of R as a language separate from S.