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.math.linear;
19
20 /**
21 * An interface to classes that implement a algorithm to calculate the
22 * QR-decomposition of a real matrix.
23 *
24 * @see <a href="http://mathworld.wolfram.com/QRDecomposition.html">MathWorld</a>
25 * @see <a href="http://en.wikipedia.org/wiki/QR_decomposition">Wikipedia</a>
26 * @version $Revision: 620312 $ $Date: 2008-02-10 12:28:59 -0700 (Sun, 10 Feb 2008) $
27 * @since 1.2
28 */
29 public interface QRDecomposition {
30
31 /**
32 * Returns the matrix R of the decomposition.
33 *
34 * @return the R matrix
35 */
36 public abstract RealMatrix getR();
37
38 /**
39 * Returns the matrix Q of the decomposition.
40 *
41 * @return the Q matrix
42 */
43 public abstract RealMatrix getQ();
44 }