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Change-Id: I52a325624a7f0dd652b362a9840626d6d9f3c42b

1 files changed, 103 insertions, 0 deletions

diff --git a/src/main/java/org/apache/commons/math/stat/descriptive/moment/VectorialMean.java b/src/main/java/org/apache/commons/math/stat/descriptive/moment/VectorialMean.java
new file mode 100644
index 0000000..ef57657
--- /dev/null
+++ b/src/main/java/org/apache/commons/math/stat/descriptive/moment/VectorialMean.java
@@ -0,0 +1,103 @@
+/*
+ * 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.math.stat.descriptive.moment;
+
+import java.io.Serializable;
+import java.util.Arrays;
+
+import org.apache.commons.math.DimensionMismatchException;
+
+/**
+ * Returns the arithmetic mean of the available vectors.
+ * @since 1.2
+ * @version $Revision: 922714 $ $Date: 2010-03-14 02:35:14 +0100 (dim. 14 mars 2010) $
+ */
+public class VectorialMean implements Serializable {
+
+    /** Serializable version identifier */
+    private static final long serialVersionUID = 8223009086481006892L;
+
+    /** Means for each component. */
+    private final Mean[] means;
+
+    /** Constructs a VectorialMean.
+     * @param dimension vectors dimension
+     */
+    public VectorialMean(int dimension) {
+        means = new Mean[dimension];
+        for (int i = 0; i < dimension; ++i) {
+            means[i] = new Mean();
+        }
+    }
+
+    /**
+     * Add a new vector to the sample.
+     * @param v vector to add
+     * @exception DimensionMismatchException if the vector does not have the right dimension
+     */
+    public void increment(double[] v) throws DimensionMismatchException {
+        if (v.length != means.length) {
+            throw new DimensionMismatchException(v.length, means.length);
+        }
+        for (int i = 0; i < v.length; ++i) {
+            means[i].increment(v[i]);
+        }
+    }
+
+    /**
+     * Get the mean vector.
+     * @return mean vector
+     */
+    public double[] getResult() {
+        double[] result = new double[means.length];
+        for (int i = 0; i < result.length; ++i) {
+            result[i] = means[i].getResult();
+        }
+        return result;
+    }
+
+    /**
+     * Get the number of vectors in the sample.
+     * @return number of vectors in the sample
+     */
+    public long getN() {
+        return (means.length == 0) ? 0 : means[0].getN();
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + Arrays.hashCode(means);
+        return result;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (!(obj instanceof VectorialMean))
+            return false;
+        VectorialMean other = (VectorialMean) obj;
+        if (!Arrays.equals(means, other.means))
+            return false;
+        return true;
+    }
+
+}