From: Florent Baty <florent.baty_at_unibas.ch>

Date: Sat 29 Oct 2005 - 02:01:14 EST

d = xpts[i] - x[j];

ksum += dnorm(d / *h, 0, 1, 0);

*}
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result[i] = ksum / ((*n) * (*h));

*}
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*}
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R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Sat Oct 29 02:25:13 2005

Date: Sat 29 Oct 2005 - 02:01:14 EST

Dear R users,

I read on the "Introduction to the .C Interface to R" by Peng & Leeuw (http://www.biostat.jhsph.edu/~rpeng/docs/interface.pdf) that it is possible to use a few R functions (such as "dnorm") within C by including the "Rmath.h" header file in your C code: e.g.

#include <R.h>

#include <Rmath.h>

void kernel_smooth(double *x, int *n, double *xpts, int *nxpts,
double *h, double *result)

{

int i, j;

double d, ksum;

for(i=0; i < *nxpts; i++) { ksum = 0; for(j=0; j < *n; j++) {

d = xpts[i] - x[j];

ksum += dnorm(d / *h, 0, 1, 0);

result[i] = ksum / ((*n) * (*h));

In the manual "Writing R extensions" there is also a list of special functions which can be called in C.

I was wondering whether there is a way to call any other R functions similarly. Is there any documented exemple available somewhere?

Thanks a lot for your help,

Florent

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Sat Oct 29 02:25:13 2005

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