Geografic-Information-System/lib/cluster/c_distinct.c

#include <grass/cluster.h>

int I_cluster_distinct(struct Cluster *C, double separation)
{
    int class1, class2;
    int distinct;
    double dmin;
    double dsep;

    /* compute sum of squares for each class */
    I_cluster_sum2(C);

    /* find closest classes */
    distinct = 1;
    dmin = separation;
    for (class1 = 0; class1 < (C->nclasses - 1); class1++) {
	if (C->count[class1] < 2)
	    continue;
	for (class2 = class1 + 1; class2 < C->nclasses; class2++) {
	    if (C->count[class2] < 2)
		continue;
	    dsep = I_cluster_separation(C, class1, class2);

	    if (dsep >= 0.0 && dsep < dmin) {
		distinct = 0;
		C->merge1 = class1;
		C->merge2 = class2;
		dmin = dsep;
	    }
	}
    }

    return distinct;
}