[R] ERP software

Prof Brian D Ripley ripley at stats.ox.ac.uk
Thu Jul 5 22:50:17 CEST 2001

On Thu, 5 Jul 2001, Duncan Murdoch wrote:

> On Thu, 5 Jul 2001 11:50:07 -0600 (MDT), you wrote in message
> <Pine.GSO.4.30.0107051146130.3217-100000 at goldhill.cgd.ucar.edu>:
> >I think you're missing the point about *realtime* ...
> >
> >opening and reading a static file is one thing -- having event-driven
> >reads (i.e. potentially asynchronous reads) directly from the instrument
> >is another.
> If the instrument can be opened as a Unix file, then connections
> should work, as should the older Rstreams.  You don't have event
> driven programming in R, but you can tell your R code to run a loop
> where it tries to read the next input from the instrument.  If there's
> nothing available, it will block until the data arrives, just like
> "cat" or any other Unix utility would.

You can also have non-blocking connections in 1.3.0, especially on fifos
(but only on Unix).  I am not sure we have the optimal semantics, so
feedback on this would be welcome (on R-devel, I think as it can be very

> See ?connections for help.
> Duncan Murdoch

Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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