    001    /*
    002     * Licensed to the Apache Software Foundation (ASF) under one or more
    003     * contributor license agreements.  See the NOTICE file distributed with
    004     * this work for additional information regarding copyright ownership.
    005     * The ASF licenses this file to You under the Apache License, Version 2.0
    006     * (the "License"); you may not use this file except in compliance with
    007     * the License.  You may obtain a copy of the License at
    008     *
    009     *      http://www.apache.org/licenses/LICENSE-2.0
    010     *
    011     * Unless required by applicable law or agreed to in writing, software
    012     * distributed under the License is distributed on an "AS IS" BASIS,
    013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014     * See the License for the specific language governing permissions and
    015     * limitations under the License.
    016     */
    017
    018    package org.apache.commons.math3.linear;
    019
    020    import org.apache.commons.math3.exception.MathIllegalArgumentException;
    021    import org.apache.commons.math3.exception.util.LocalizedFormats;
    022
    023    /**
    024     * Exception to be thrown when a self-adjoint {@link RealLinearOperator}
    025     * is expected.
    026     * Since the coefficients of the matrix are not accessible, the most
    027     * general definition is used to check that A is not self-adjoint, i.e.
    028     * there exist x and y such as {@code | x' A y - y' A x | >= eps},
    029     * where {@code eps} is a user-specified tolerance, and {@code x'}
    030     * denotes the transpose of {@code x}.
    031     * In the terminology of this exception, {@code A} is the "offending"
    032     * linear operator, {@code x} and {@code y} are the first and second
    033     * "offending" vectors, respectively.
    034     *
    035     * @version $Id: NonSelfAdjointOperatorException.java 1416643 2012-12-03 19:37:14Z tn $
    036     * @since 3.0
    037     */
    038    public class NonSelfAdjointOperatorException
    039        extends MathIllegalArgumentException {
    040        /** Serializable version Id. */
    041        private static final long serialVersionUID = 1784999305030258247L;
    042
    043        /** Creates a new instance of this class. */
    044        public NonSelfAdjointOperatorException() {
    045            super(LocalizedFormats.NON_SELF_ADJOINT_OPERATOR);
    046        }
    047    }