Package org.apache.commons.math3.linear

Class LUDecomposition.Solver

java.lang.Object

org.apache.commons.math3.linear.LUDecomposition.Solver

All Implemented Interfaces:

DecompositionSolver

Enclosing class:

LUDecomposition

private static class LUDecomposition.Solver
extends java.lang.Object
implements DecompositionSolver

Specialized solver.

Field Summary

Fields

Modifier and Type	Field	Description
private double[][]	lu	Entries of LU decomposition.
private int[]	pivot	Pivot permutation associated with LU decomposition.
private boolean	singular	Singularity indicator.

Constructor Summary

Constructors

Modifier	Constructor	Description
private	Solver(double[][] lu, int[] pivot, boolean singular)	Build a solver from decomposed matrix.

Method Summary

Modifier and Type	Method	Description
RealMatrix	getInverse()	Get the inverse of the decomposed matrix.
boolean	isNonSingular()	Check if the decomposed matrix is non-singular.
RealMatrix	solve(RealMatrix b)	Solve the linear equation A × X = B for matrices A.
RealVector	solve(RealVector b)	Solve the linear equation A × X = B for matrices A.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

lu

private final double[][] lu

Entries of LU decomposition.

pivot

private final int[] pivot

Pivot permutation associated with LU decomposition.

singular

private final boolean singular

Singularity indicator.

Constructor Detail

Solver

private Solver(double[][] lu,
               int[] pivot,
               boolean singular)

Build a solver from decomposed matrix.

Parameters:

lu - entries of LU decomposition

pivot - pivot permutation associated with LU decomposition

singular - singularity indicator

Method Detail

isNonSingular

public boolean isNonSingular()

Check if the decomposed matrix is non-singular.

Specified by:

isNonSingular in interface DecompositionSolver

Returns:

true if the decomposed matrix is non-singular.

solve

public RealVector solve(RealVector b)

Solve the linear equation A × X = B for matrices A.

The A matrix is implicit, it is provided by the underlying decomposition algorithm.

Specified by:

solve in interface DecompositionSolver

Parameters:

b - right-hand side of the equation A × X = B

Returns:

a vector X that minimizes the two norm of A × X - B

solve

public RealMatrix solve(RealMatrix b)

Solve the linear equation A × X = B for matrices A.

The A matrix is implicit, it is provided by the underlying decomposition algorithm.

Specified by:

solve in interface DecompositionSolver

Parameters:

b - right-hand side of the equation A × X = B

Returns:

a matrix X that minimizes the two norm of A × X - B

getInverse

public RealMatrix getInverse()

Get the inverse of the decomposed matrix.

Specified by:

getInverse in interface DecompositionSolver

Returns:

the inverse matrix.

Throws:

SingularMatrixException - if the decomposed matrix is singular.