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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.commons.math3.linear;
18  
19  /**
20   * Marker class for RealVectors that require sparse backing storage
21   * <p>
22   *  Caveat: Implementation are allowed to assume that, for any {@code x},
23   *  the equality {@code x * 0d == 0d} holds. But it is is not true for
24   *  {@code NaN}. Moreover, zero entries will lose their sign.
25   *  Some operations (that involve {@code NaN} and/or infinities) may
26   *  thus give incorrect results, like multiplications, divisions or
27   *  functions mapping.
28   * </p>
29   * @since 2.0
30   */
31  public abstract class SparseRealVector extends RealVector {}