001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017
018 package org.apache.commons.math.stat.clustering;
019
020 import java.util.Collection;
021
022 /**
023 * Interface for points that can be clustered together.
024 * @param <T> the type of point that can be clustered
025 * @version $Revision: 811685 $ $Date: 2009-09-05 19:36:48 +0200 (sam. 05 sept. 2009) $
026 * @since 2.0
027 */
028 public interface Clusterable<T> {
029
030 /**
031 * Returns the distance from the given point.
032 *
033 * @param p the point to compute the distance from
034 * @return the distance from the given point
035 */
036 double distanceFrom(T p);
037
038 /**
039 * Returns the centroid of the given Collection of points.
040 *
041 * @param p the Collection of points to compute the centroid of
042 * @return the centroid of the given Collection of Points
043 */
044 T centroidOf(Collection<T> p);
045
046 }