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1   /*
2    * Licensed to the Hipparchus project 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 Hipparchus project 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    *      https://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.hipparchus.linear;
19  
20  /** Matrix decomposer using QR-decomposition.
21   * @since 1.3
22   */
23  public class QRDecomposer implements MatrixDecomposer {
24  
25      /** Threshold under which a matrix is considered singular. */
26      private final double singularityThreshold;
27  
28      /**
29       * Creates a QR decomposer with specify threshold for several matrices.
30       * @param singularityThreshold threshold (based on partial row norm)
31       * under which a matrix is considered singular
32       */
33      public QRDecomposer(final double singularityThreshold) {
34          this.singularityThreshold = singularityThreshold;
35      }
36  
37      /** {@inheritDoc} */
38      @Override
39      public DecompositionSolver decompose(final RealMatrix a) {
40          return new QRDecomposition(a, singularityThreshold).getSolver();
41      }
42  
43  }