[R] calling R from java

Prof Brian Ripley ripley at stats.ox.ac.uk
Wed Apr 21 20:35:58 CEST 2004

A third way is to start R with --slave --save (in that order).

On Wed, 21 Apr 2004, Xiao, Nick [RA] wrote:

> There are two ways to do what you want to do: 
> 1. Explicitly use save() in R. Something like: o.write("save(obj1, obj2,
> file=\"filename\")") to save a select set of R objects to a file you specify
> (can be retrieved with load later), or

Or use save.image to save all the objects.

> 2. When you quit R: o.write("quit(\"yes\")\n") instead of
> o.write("quit(\"no\")\n") to save everything to the .Rdata
> HTH, 
> Nick
> -----Original Message-----
> Hello,
> I need to call R from a java(swing) application. I manage to do it with
> something like :
> Process p = Runtime.getRuntime().exec("R --slave")
> OutputStreanWriter o = new OutputStreamWriter(p.getOutputStream())
> o.wrote("...")
> ... etc
> but at the end no .Rdata file has been created and there are some data I
> don't want to reload each time (for time execution reasons).
> So,
> Is it possible when calling R from java to create a .Rdata file to save
> data and as a consequence when recalling in the same directory not to have
> to reload those data ?
>  (Maybe the option --slave need to be changed ? )

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 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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