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17 package org.apache.commons.math.stat.descriptive.moment;
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19 import java.io.Serializable;
20 import java.util.Arrays;
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22 import org.apache.commons.math.DimensionMismatchException;
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29 public class VectorialMean implements Serializable {
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31
32 private static final long serialVersionUID = 8223009086481006892L;
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35 private Mean[] means;
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40 public VectorialMean(int dimension) {
41 means = new Mean[dimension];
42 for (int i = 0; i < dimension; ++i) {
43 means[i] = new Mean();
44 }
45 }
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52 public void increment(double[] v) throws DimensionMismatchException {
53 if (v.length != means.length) {
54 throw new DimensionMismatchException(v.length, means.length);
55 }
56 for (int i = 0; i < v.length; ++i) {
57 means[i].increment(v[i]);
58 }
59 }
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65 public double[] getResult() {
66 double[] result = new double[means.length];
67 for (int i = 0; i < result.length; ++i) {
68 result[i] = means[i].getResult();
69 }
70 return result;
71 }
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77 public long getN() {
78 return (means.length == 0) ? 0 : means[0].getN();
79 }
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82 @Override
83 public int hashCode() {
84 final int prime = 31;
85 int result = 1;
86 result = prime * result + Arrays.hashCode(means);
87 return result;
88 }
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91 @Override
92 public boolean equals(Object obj) {
93 if (this == obj)
94 return true;
95 if (obj == null)
96 return false;
97 if (!(obj instanceof VectorialMean))
98 return false;
99 VectorialMean other = (VectorialMean) obj;
100 if (!Arrays.equals(means, other.means))
101 return false;
102 return true;
103 }
104
105 }