[R] embedding R?

[Peter Dalgaard BSA]

Aaron J Mackey <ajm6q at virginia.edu> writes:

> int main(int argc, char **argv) {
> 
>     int n;
>     int i[MAXNUM];
> 
>     for(n = 1 ; n < argc && n <= MAXNUM ; n++) {
>         i[n-1] = atoi(argv[n]);
>     }
> 
>     printf("mean: %4.2f\n", R_mean(i, n - 1));
>     exit(0);
> }
> 
> % gcc -lR mean.c -o mean
> % mean 4 5 6 7
> mean: 5.5
> % exit
> 
> Where "R_mean" is calling the R function mean() ???
> 
> Any help is appreciated.  And I'm not going to worry about graphical
> functions just yet.  Just need a pointer or two into the right piece of
> documentation.

This easily gets involved, but:

You can link R as a dynamic library. You'll need to convert C
structures to and from R internal storage form. Some of the
lower-level functions work on C structures directly. There's also the
possibility of building the standalone mathlib.

Much of R sits at the interpreted level, so you'd probably want to be
able to call the parser/evaluator rather than R's internal C code.
There's a rudimentary example of such a thing in the R_eval function
in tcltk.c. (This assumes that the variables you're dealing with are
already known to R, so you'd have to find a way of making that so...).

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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