public static SimilarUser[] getTopNFriends(List<SimilarUser> similarUsers, int topN) {
// sort friends based on itemAgreement
SimilarUser.sort(similarUsers);
// select top N friends
List<SimilarUser> topFriends = new ArrayList<SimilarUser>();
for (SimilarUser f : similarUsers) {
if (topFriends.size() >= topN) {
// have enough friends.
break;
}
// This is useful when we compose results from different recommenders
if (!topFriends.contains(f)) {
topFriends.add(f);
}
}
return topFriends.toArray(new SimilarUser[topFriends.size()]);
}
/**
* Prints a list of user names with their similarities.
*
* @param friends similar users
* @param header title that will be printed at the top of the list.
*/
public static void print(SimilarUser[] friends, String header) {
System.out.println("\n" + header + "\n");
for (SimilarUser f : friends) {
System.out.printf("name: %-36s, similarity: %f\n", f.getName(), f.getSimilarity());
}
}