Hi there,
I want to call a C function in R. I have some experience on it, but this time I need to call another C function in the "main" C function. As a simple example, I use the following C code:
#include <stdio.h> #include <math.h> #include <stdlib.h> #include <time.h>
void main(double *alpha)
1. don't call it "main". 2. alpha must not be a pointer.
{ double test(); double beta; beta= *alpha *2 + test(*alpha); }
double test(double *alpha) { double value; value = *alpha *3; return(value); }
I used "gcc -c main.c" and "Rcmd SHLIB main.o" and I got the main.dll file. In R I use the following code to call the C function "main":
3. "Rcmd SHLIB main" is sufficient.
dyn.load("c:/Program Files/R/rw1060/bin/main.dll")
4. Why do you compile in R's /bin directory? That's not necessary, it's rather confusing.
Uwe Ligges
a=4.2 b=.C('main', as.double(a))
But the R system crashed. I know I can only define the function type in C as "void" to be called by R. But what if I want to call another C function in the "main" C function? Thank you for your help!
Sincerely,
Lei Liu
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