select_random_points_based_on_threshold

Script

import java.util.ArrayList;
ArrayList usedPositions = new ArrayList();
int my_num_presences = Integer.parseInt(num_presences);
int my_num_absences = Integer.parseInt(num_absences);
double my_threshold = Double.parseDouble(threshold);
String[] points = points_xml.split("\n");
String[] values = model_values.split(" ");
StringBuilder absences = new StringBuilder();
StringBuilder presences = new StringBuilder();
int total_presences = 0;
int total_absences = 0;
int rp;
String presences_delim = "";
String absences_delim = "";
while (total_presences < my_num_presences || total_absences < my_num_absences) {
	rp = (int)(Math.random()*values.length);
	while (usedPositions.contains(rp)) {
		rp = (int)(Math.random()*values.length);
	}
	usedPositions.add(rp);
	value = Double.parseDouble( values[rp] );
	if (value >= my_threshold) {
		/* presence */
		if (total_presences < my_num_presences) {
			presences.append(presences_delim);
			presences.append(points[rp]);
			presences_delim = "\n";
			++total_presences;
		}
	}
	else {
		/* absence */
		if (total_absences < my_num_absences) {
			absences.append(absences_delim);
			absences.append(points[rp]);
			absences_delim = "\n";
			++total_absences;
		}
	}
}
presence_points_xml = presences.toString();
absence_points_xml = absences.toString();