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Change-Id: I52a325624a7f0dd652b362a9840626d6d9f3c42b

1 files changed, 120 insertions, 0 deletions

diff --git a/src/main/java/org/apache/commons/math/stat/descriptive/StatisticalMultivariateSummary.java b/src/main/java/org/apache/commons/math/stat/descriptive/StatisticalMultivariateSummary.java
new file mode 100644
index 0000000..517788c
--- /dev/null
+++ b/src/main/java/org/apache/commons/math/stat/descriptive/StatisticalMultivariateSummary.java
@@ -0,0 +1,120 @@
+/*
+ * 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;
+
+import org.apache.commons.math.linear.RealMatrix;
+
+/**
+ *  Reporting interface for basic multivariate statistics.
+ *
+ * @since 1.2
+ * @version $Revision: 811786 $ $Date: 2009-09-06 11:36:08 +0200 (dim. 06 sept. 2009) $
+ */
+public interface StatisticalMultivariateSummary {
+
+    /**
+     * Returns the dimension of the data
+     * @return The dimension of the data
+     */
+    int getDimension();
+
+    /**
+     * Returns an array whose i<sup>th</sup> entry is the
+     * mean of the i<sup>th</sup> entries of the arrays
+     * that correspond to each multivariate sample
+     *
+     * @return the array of component means
+     */
+    double[] getMean();
+
+    /**
+     * Returns the covariance of the available values.
+     * @return The covariance, null if no multivariate sample
+     * have been added or a zeroed matrix for a single value set.
+     */
+    RealMatrix getCovariance();
+
+    /**
+     * Returns an array whose i<sup>th</sup> entry is the
+     * standard deviation of the i<sup>th</sup> entries of the arrays
+     * that correspond to each multivariate sample
+     *
+     * @return the array of component standard deviations
+     */
+    double[] getStandardDeviation();
+
+    /**
+     * Returns an array whose i<sup>th</sup> entry is the
+     * maximum of the i<sup>th</sup> entries of the arrays
+     * that correspond to each multivariate sample
+     *
+     * @return the array of component maxima
+     */
+    double[] getMax();
+
+    /**
+     * Returns an array whose i<sup>th</sup> entry is the
+     * minimum of the i<sup>th</sup> entries of the arrays
+     * that correspond to each multivariate sample
+     *
+     * @return the array of component minima
+     */
+    double[] getMin();
+
+    /**
+     * Returns the number of available values
+     * @return The number of available values
+     */
+    long getN();
+
+    /**
+     * Returns an array whose i<sup>th</sup> entry is the
+     * geometric mean of the i<sup>th</sup> entries of the arrays
+     * that correspond to each multivariate sample
+     *
+     * @return the array of component geometric means
+     */
+    double[] getGeometricMean();
+
+    /**
+     * Returns an array whose i<sup>th</sup> entry is the
+     * sum of the i<sup>th</sup> entries of the arrays
+     * that correspond to each multivariate sample
+     *
+     * @return the array of component sums
+     */
+    double[] getSum();
+
+    /**
+     * Returns an array whose i<sup>th</sup> entry is the
+     * sum of squares of the i<sup>th</sup> entries of the arrays
+     * that correspond to each multivariate sample
+     *
+     * @return the array of component sums of squares
+     */
+    double[] getSumSq();
+
+    /**
+     * Returns an array whose i<sup>th</sup> entry is the
+     * sum of logs of the i<sup>th</sup> entries of the arrays
+     * that correspond to each multivariate sample
+     *
+     * @return the array of component log sums
+     */
+    double[] getSumLog();
+
+}