[R] perl advice

Guido Masarotto guido at hal.stat.unipd.it
Mon Dec 6 23:45:08 CET 1999

On Mon, Dec 06, 1999 at 05:12:44PM -0500, John D. Barnett wrote:
> Hello-
> Does anyone have a recommendation on how to call R from perl?  I'm using
> the IPC::Open2 module, and running R with the --slave and --quiet
> options.  The problem is that I can't predict how many lines of output I
> should try to read for each command-- if any!
> The ultimate goal is to use perl to provide a form-driven web interface,
> but have R do the underlying calculations.

  A trick that I have used sometimes from tcl/tk is to redefine the
  prompt to some funny string (sending to the controlled process
  a 'option(prompt=...) command at the beginning) and then wait
  for the prompt on the output. If I remember also ESS
  works in a  probably less weaker but similar approach (i.e., it
  waits for a particular regular expression on the standard output
  of the R process).
  Hoping this can help,

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