[R] Controlling R from Java

[Marc Grushcow]

I'd like to run R (LINUX) under Java. I can create the process and connect to
stdin and stdout. I can send commands in and get output back.  I don't know how
to determine when the output is complete - there is no trailing "prompt".

For example, if I send "ls()\n" what I get back is:
> ls()
character(0)

Each of the above two lines is terminated with a 0x0A. I would have expected
(liked)...
ls()
character(0)
> 

Then I could parse for the "\n> " and know when the output is complete. The
problem with checking for data availability on the input stream is that it is
unreliable. R's output buffer might flush unpredictably and/or the task
switching OS might cause R to stop after one buffer is full but before another
is completed.  In any case, it is the usual problem of one program trying to
parse another's output in a time sharing environment.

I'm sure that this problem has been solved before.  Any suggestions would be
appreciated.

Thanks
Marc
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mailto:Marc.Grushcow at NTT.ca		http://www.NTT.ca
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