[Rd] Returning vectors of two different data types back to R environment (from C).

Roger Bivand Roger.Bivand at nhh.no
Fri Nov 16 22:00:41 CET 2007

On Fri, 16 Nov 2007, Charles Danko wrote:

> Hello,
> Quick question.
> I have written a C function - I would like to make it return two vectors to
> the R environment - one STRSXP vector, and one INTSXP vector.  Is this
> possible/ easy to do using the API?
> I looked, but could not find the answer to this  question in the "Writing R
> Extensions" guide.

Put them in a list? The SEXP function in the .Call() interface then 
returns a list wich you unpack on the R side. There are plenty of examples 
in the base code and in numerous contributed packages.

> Thanks very much for your help!
> Charles
> 	[[alternative HTML version deleted]]
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Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no

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