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view libs/commons-math-2.1/docs/apidocs/src-html/org/apache/commons/math/linear/DecompositionSolver.html @ 13:cbf34dd4d7e6
commons-math-2.1 added
| author | dwinter |
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| date | Tue, 04 Jan 2011 10:02:07 +0100 |
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<HTML> <BODY BGCOLOR="white"> <PRE> <FONT color="green">001</FONT> /*<a name="line.1"></a> <FONT color="green">002</FONT> * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.2"></a> <FONT color="green">003</FONT> * contributor license agreements. See the NOTICE file distributed with<a name="line.3"></a> <FONT color="green">004</FONT> * this work for additional information regarding copyright ownership.<a name="line.4"></a> <FONT color="green">005</FONT> * The ASF licenses this file to You under the Apache License, Version 2.0<a name="line.5"></a> <FONT color="green">006</FONT> * (the "License"); you may not use this file except in compliance with<a name="line.6"></a> <FONT color="green">007</FONT> * the License. You may obtain a copy of the License at<a name="line.7"></a> <FONT color="green">008</FONT> *<a name="line.8"></a> <FONT color="green">009</FONT> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.9"></a> <FONT color="green">010</FONT> *<a name="line.10"></a> <FONT color="green">011</FONT> * Unless required by applicable law or agreed to in writing, software<a name="line.11"></a> <FONT color="green">012</FONT> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.12"></a> <FONT color="green">013</FONT> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.13"></a> <FONT color="green">014</FONT> * See the License for the specific language governing permissions and<a name="line.14"></a> <FONT color="green">015</FONT> * limitations under the License.<a name="line.15"></a> <FONT color="green">016</FONT> */<a name="line.16"></a> <FONT color="green">017</FONT> <a name="line.17"></a> <FONT color="green">018</FONT> package org.apache.commons.math.linear;<a name="line.18"></a> <FONT color="green">019</FONT> <a name="line.19"></a> <FONT color="green">020</FONT> <a name="line.20"></a> <FONT color="green">021</FONT> <a name="line.21"></a> <FONT color="green">022</FONT> /**<a name="line.22"></a> <FONT color="green">023</FONT> * Interface handling decomposition algorithms that can solve A &times; X = B.<a name="line.23"></a> <FONT color="green">024</FONT> * <p>Decomposition algorithms decompose an A matrix has a product of several specific<a name="line.24"></a> <FONT color="green">025</FONT> * matrices from which they can solve A &times; X = B in least squares sense: they find X<a name="line.25"></a> <FONT color="green">026</FONT> * such that ||A &times; X - B|| is minimal.</p><a name="line.26"></a> <FONT color="green">027</FONT> * <p>Some solvers like {@link LUDecomposition} can only find the solution for<a name="line.27"></a> <FONT color="green">028</FONT> * square matrices and when the solution is an exact linear solution, i.e. when<a name="line.28"></a> <FONT color="green">029</FONT> * ||A &times; X - B|| is exactly 0. Other solvers can also find solutions<a name="line.29"></a> <FONT color="green">030</FONT> * with non-square matrix A and with non-null minimal norm. If an exact linear<a name="line.30"></a> <FONT color="green">031</FONT> * solution exists it is also the minimal norm solution.</p><a name="line.31"></a> <FONT color="green">032</FONT> *<a name="line.32"></a> <FONT color="green">033</FONT> * @version $Revision: 811685 $ $Date: 2009-09-05 13:36:48 -0400 (Sat, 05 Sep 2009) $<a name="line.33"></a> <FONT color="green">034</FONT> * @since 2.0<a name="line.34"></a> <FONT color="green">035</FONT> */<a name="line.35"></a> <FONT color="green">036</FONT> public interface DecompositionSolver {<a name="line.36"></a> <FONT color="green">037</FONT> <a name="line.37"></a> <FONT color="green">038</FONT> /** Solve the linear equation A &times; X = B for matrices A.<a name="line.38"></a> <FONT color="green">039</FONT> * <p>The A matrix is implicit, it is provided by the underlying<a name="line.39"></a> <FONT color="green">040</FONT> * decomposition algorithm.</p><a name="line.40"></a> <FONT color="green">041</FONT> * @param b right-hand side of the equation A &times; X = B<a name="line.41"></a> <FONT color="green">042</FONT> * @return a vector X that minimizes the two norm of A &times; X - B<a name="line.42"></a> <FONT color="green">043</FONT> * @exception IllegalArgumentException if matrices dimensions don't match<a name="line.43"></a> <FONT color="green">044</FONT> * @exception InvalidMatrixException if decomposed matrix is singular<a name="line.44"></a> <FONT color="green">045</FONT> */<a name="line.45"></a> <FONT color="green">046</FONT> double[] solve(final double[] b)<a name="line.46"></a> <FONT color="green">047</FONT> throws IllegalArgumentException, InvalidMatrixException;<a name="line.47"></a> <FONT color="green">048</FONT> <a name="line.48"></a> <FONT color="green">049</FONT> /** Solve the linear equation A &times; X = B for matrices A.<a name="line.49"></a> <FONT color="green">050</FONT> * <p>The A matrix is implicit, it is provided by the underlying<a name="line.50"></a> <FONT color="green">051</FONT> * decomposition algorithm.</p><a name="line.51"></a> <FONT color="green">052</FONT> * @param b right-hand side of the equation A &times; X = B<a name="line.52"></a> <FONT color="green">053</FONT> * @return a vector X that minimizes the two norm of A &times; X - B<a name="line.53"></a> <FONT color="green">054</FONT> * @exception IllegalArgumentException if matrices dimensions don't match<a name="line.54"></a> <FONT color="green">055</FONT> * @exception InvalidMatrixException if decomposed matrix is singular<a name="line.55"></a> <FONT color="green">056</FONT> */<a name="line.56"></a> <FONT color="green">057</FONT> RealVector solve(final RealVector b)<a name="line.57"></a> <FONT color="green">058</FONT> throws IllegalArgumentException, InvalidMatrixException;<a name="line.58"></a> <FONT color="green">059</FONT> <a name="line.59"></a> <FONT color="green">060</FONT> /** Solve the linear equation A &times; X = B for matrices A.<a name="line.60"></a> <FONT color="green">061</FONT> * <p>The A matrix is implicit, it is provided by the underlying<a name="line.61"></a> <FONT color="green">062</FONT> * decomposition algorithm.</p><a name="line.62"></a> <FONT color="green">063</FONT> * @param b right-hand side of the equation A &times; X = B<a name="line.63"></a> <FONT color="green">064</FONT> * @return a matrix X that minimizes the two norm of A &times; X - B<a name="line.64"></a> <FONT color="green">065</FONT> * @exception IllegalArgumentException if matrices dimensions don't match<a name="line.65"></a> <FONT color="green">066</FONT> * @exception InvalidMatrixException if decomposed matrix is singular<a name="line.66"></a> <FONT color="green">067</FONT> */<a name="line.67"></a> <FONT color="green">068</FONT> RealMatrix solve(final RealMatrix b)<a name="line.68"></a> <FONT color="green">069</FONT> throws IllegalArgumentException, InvalidMatrixException;<a name="line.69"></a> <FONT color="green">070</FONT> <a name="line.70"></a> <FONT color="green">071</FONT> /**<a name="line.71"></a> <FONT color="green">072</FONT> * Check if the decomposed matrix is non-singular.<a name="line.72"></a> <FONT color="green">073</FONT> * @return true if the decomposed matrix is non-singular<a name="line.73"></a> <FONT color="green">074</FONT> */<a name="line.74"></a> <FONT color="green">075</FONT> boolean isNonSingular();<a name="line.75"></a> <FONT color="green">076</FONT> <a name="line.76"></a> <FONT color="green">077</FONT> /** Get the inverse (or pseudo-inverse) of the decomposed matrix.<a name="line.77"></a> <FONT color="green">078</FONT> * @return inverse matrix<a name="line.78"></a> <FONT color="green">079</FONT> * @throws InvalidMatrixException if decomposed matrix is singular<a name="line.79"></a> <FONT color="green">080</FONT> */<a name="line.80"></a> <FONT color="green">081</FONT> RealMatrix getInverse()<a name="line.81"></a> <FONT color="green">082</FONT> throws InvalidMatrixException;<a name="line.82"></a> <FONT color="green">083</FONT> <a name="line.83"></a> <FONT color="green">084</FONT> }<a name="line.84"></a> </PRE> </BODY> </HTML>