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
18 package org.apache.commons.math4.legacy.linear;
19
20 /**
21 * This is an implementation of {@link UnmodifiableRealVectorAbstractTest} for
22 * unmodifiable views of {@link OpenMapRealVector}.
23 *
24 */
25 public class UnmodifiableOpenMapRealVectorTest
26 extends UnmodifiableRealVectorAbstractTest {
27 /** To ensure sufficient sparsity. */
28 public static final double PROBABILITY_OF_ZERO = 0.5;
29
30 /**
31 * Returns a random vector of type {@link ArrayRealVector}.
32 *
33 * @return a new random {@link ArrayRealVector}.
34 */
35 @Override
36 public RealVector createVector() {
37 OpenMapRealVector v = new OpenMapRealVector(DIM, EPS);
38 for (int i = 0; i < DIM; i++) {
39 if (RANDOM.nextDouble() > PROBABILITY_OF_ZERO) {
40 v.setEntry(i, RANDOM.nextDouble());
41 }
42 }
43 return v;
44 }
45 }