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Diffstat (limited to 'src/main/java/org/apache/commons/math3/stat/clustering/EuclideanDoublePoint.java')
-rw-r--r-- | src/main/java/org/apache/commons/math3/stat/clustering/EuclideanDoublePoint.java | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/src/main/java/org/apache/commons/math3/stat/clustering/EuclideanDoublePoint.java b/src/main/java/org/apache/commons/math3/stat/clustering/EuclideanDoublePoint.java new file mode 100644 index 0000000..32c236c --- /dev/null +++ b/src/main/java/org/apache/commons/math3/stat/clustering/EuclideanDoublePoint.java @@ -0,0 +1,100 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.apache.commons.math3.stat.clustering; + +import java.io.Serializable; +import java.util.Collection; +import java.util.Arrays; + +import org.apache.commons.math3.util.MathArrays; + +/** + * A simple implementation of {@link Clusterable} for points with double coordinates. + * @since 3.1 + * @deprecated As of 3.2 (to be removed in 4.0), + * use {@link org.apache.commons.math3.ml.clustering.DoublePoint} instead + */ +@Deprecated +public class EuclideanDoublePoint implements Clusterable<EuclideanDoublePoint>, Serializable { + + /** Serializable version identifier. */ + private static final long serialVersionUID = 8026472786091227632L; + + /** Point coordinates. */ + private final double[] point; + + /** + * Build an instance wrapping an integer array. + * <p> + * The wrapped array is referenced, it is <em>not</em> copied. + * + * @param point the n-dimensional point in integer space + */ + public EuclideanDoublePoint(final double[] point) { + this.point = point; + } + + /** {@inheritDoc} */ + public EuclideanDoublePoint centroidOf(final Collection<EuclideanDoublePoint> points) { + final double[] centroid = new double[getPoint().length]; + for (final EuclideanDoublePoint p : points) { + for (int i = 0; i < centroid.length; i++) { + centroid[i] += p.getPoint()[i]; + } + } + for (int i = 0; i < centroid.length; i++) { + centroid[i] /= points.size(); + } + return new EuclideanDoublePoint(centroid); + } + + /** {@inheritDoc} */ + public double distanceFrom(final EuclideanDoublePoint p) { + return MathArrays.distance(point, p.getPoint()); + } + + /** {@inheritDoc} */ + @Override + public boolean equals(final Object other) { + if (!(other instanceof EuclideanDoublePoint)) { + return false; + } + return Arrays.equals(point, ((EuclideanDoublePoint) other).point); + } + + /** + * Get the n-dimensional point in integer space. + * + * @return a reference (not a copy!) to the wrapped array + */ + public double[] getPoint() { + return point; + } + + /** {@inheritDoc} */ + @Override + public int hashCode() { + return Arrays.hashCode(point); + } + + /** {@inheritDoc} */ + @Override + public String toString() { + return Arrays.toString(point); + } + +} |