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diff --git a/src/main/java/org/apache/commons/math3/linear/NonSymmetricMatrixException.java b/src/main/java/org/apache/commons/math3/linear/NonSymmetricMatrixException.java
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+++ b/src/main/java/org/apache/commons/math3/linear/NonSymmetricMatrixException.java
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+/*
+ * 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.linear;
+
+import org.apache.commons.math3.exception.MathIllegalArgumentException;
+import org.apache.commons.math3.exception.util.LocalizedFormats;
+
+/**
+ * Exception to be thrown when a symmetric matrix is expected.
+ *
+ * @since 3.0
+ */
+public class NonSymmetricMatrixException extends MathIllegalArgumentException {
+    /** Serializable version Id. */
+    private static final long serialVersionUID = -7518495577824189882L;
+
+    /** Row. */
+    private final int row;
+
+    /** Column. */
+    private final int column;
+
+    /** Threshold. */
+    private final double threshold;
+
+    /**
+     * Construct an exception.
+     *
+     * @param row Row index.
+     * @param column Column index.
+     * @param threshold Relative symmetry threshold.
+     */
+    public NonSymmetricMatrixException(int row, int column, double threshold) {
+        super(LocalizedFormats.NON_SYMMETRIC_MATRIX, row, column, threshold);
+        this.row = row;
+        this.column = column;
+        this.threshold = threshold;
+    }
+
+    /**
+     * @return the row index of the entry.
+     */
+    public int getRow() {
+        return row;
+    }
+
+    /**
+     * @return the column index of the entry.
+     */
+    public int getColumn() {
+        return column;
+    }
+
+    /**
+     * @return the relative symmetry threshold.
+     */
+    public double getThreshold() {
+        return threshold;
+    }
+}