Displaying 2 results from an estimated 2 matches for "ksum".
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2006 Oct 31
2
plotting multiple groups (newbie Q)
Hi Folks,
After loading a data set, I run the following:
> kSum <- orderBy(~group,(summaryBy(DP_Level~F2
+group,data=kdata,FUN=c(mean,sd),na.rm=T)))
kSum looks like this:
> kSum
F2 group DP_Level.mean DP_Level.sd
1 1.0 N -1.55186475 11.022245
4 2.0 N -2.48013300 10.624583
7 3.0 N -12.47671250 11.104792
10 4.0 N...
2005 Oct 28
1
Calling R functions from C
...ssible 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 whe...