Prof Brian Ripley wrote:
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?
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