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 symmetric, definite positive
025 * {@link RealLinearOperator} is expected.
026 * Since the coefficients of the matrix are not accessible, the most
027 * general definition is used to check that {@code A} is not positive
028 * definite, i.e. there exists {@code x} such that {@code x' A x <= 0}.
029 * In the terminology of this exception, {@code A} is the "offending"
030 * linear operator and {@code x} the "offending" vector.
031 *
032 * @version $Id: NonPositiveDefiniteOperatorException.java 1416643 2012-12-03 19:37:14Z tn $
033 * @since 3.0
034 */
035 public class NonPositiveDefiniteOperatorException
036 extends MathIllegalArgumentException {
037 /** Serializable version Id. */
038 private static final long serialVersionUID = 917034489420549847L;
039
040 /** Creates a new instance of this class. */
041 public NonPositiveDefiniteOperatorException() {
042 super(LocalizedFormats.NON_POSITIVE_DEFINITE_OPERATOR);
043 }
044 }