Geografic-Information-System/lib/stats/c_divr.c

#include <grass/gis.h>
#include <grass/stats.h>

void c_divr(DCELL * result, DCELL * values, int n, const void *closure)
{
    int count;
    DCELL prev;
    int i;

    /* sort the array of values, then count differences */

    n = sort_cell(values, n);

    if (n == 0) {
	*result = 0;
	return;
    }

    count = 1;
    prev = values[0];

    for (i = 0; i < n; i++)
	if (values[i] != prev) {
	    prev = values[i];
	    count++;
	}

    *result = (DCELL) count;
}