On 30 September 2018, Berry, Charles wrote:

>> Notice the "R> " prompt that prefixes the actual output.
>
> The issue is that babel has to clean up dangling prompts from the R session buffer and is currently not smart enough to do this in your case.
> ...
> I think your easiest path forward is to use the default R prompt. Or maybe use these header args:
>
> 	:session :results value drawer :prologue "capture.output({" :epilogue "})"

Having the "library" call in its own block, with results silent, also works.

#+NAME: setup
#+BEGIN_SRC R :session :results silent
library(ascii)
#+END_SRC

#+NAME: test01
#+BEGIN_SRC R :session :results output
numstbl <- table(1:4, 1:4)
summary(numstbl)
#+END_SRC

That's how I usually do things, perhaps because I use "ℝ>" as m prompt and I 
ran into the same problem but found this got around it (though it's been a while 
and I can't remember for sure).  It also saves time when rerunning code because 
I don't reload stuff over and over.

Bill
--
William Denton :: Toronto, Canada   ---   Listening to Art: https://listeningtoart.org/
https://www.miskatonic.org/         ---   GHG.EARTH: http://ghg.earth/
Caveat lector.                      ---   STAPLR: http://staplr.org/