search for: using_r

The docs tell me: "The header files define USING_R, which should be used to test if the code is indeed being used with R." but surely you only get that if you #include <R.h>, which you can only do if you are using R. If you have code that you might want to compile in R and for other purposes, how can you detect this? As an example...

Dear People, I have been trying to learn how to use the .C interface. A friend gave me a toy example, and I have been playing with it. It is (C code) #ifdef USING_R typedef int Sint; #else typedef long Sint; #endif void kosum(double *a, double *b, Sint *na) { int i, j, nab; double temp; nab=*na; temp=0.0; for(i=0;i < nab; i++) { temp=temp+a[i]; } *b=temp; } And the calling code in R is test1<- function(a, b) { .C(&q...