Did you follow the instructions in Writing R Extensions?
You need to make sure you include the proper header files, as length
is a C and not C++ export from R.bin, and in any case it is remapped in R.
On Mon, 1 Sep 2003, Philip Silva wrote:
> Hi,
>
> I've created a shared library from including this code (with g++
> -I/usr/local/lib/R/include -I/usr/local/include -c Rtest.cpp; g++
> -shared -L/usr/local/lib -o Rtest.so Rtest.cpp):
> void check_data (SEXP data) {
> int l=length (data);
> }
>
> But when I try to load it in R I get this error message:
> unable to load shared library ...
> ...
> undefined symbol: _Z9Rf_lengthP7SEXPREC
>
> How can I solve this problem?
--
Brian D. Ripley, [EMAIL PROTECTED]
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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