org.apache.commons.math.linear
Class EigenDecompositionImpl.Solver

java.lang.Object
  extended by org.apache.commons.math.linear.EigenDecompositionImpl.Solver
All Implemented Interfaces:
DecompositionSolver
Enclosing class:
EigenDecompositionImpl

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

Specialized solver.


Field Summary
private  ArrayRealVector[] eigenvectors
          Eigenvectors.
private  double[] imagEigenvalues
          Imaginary part of the realEigenvalues.
private  double[] realEigenvalues
          Real part of the realEigenvalues.
 
Constructor Summary
private EigenDecompositionImpl.Solver(double[] realEigenvalues, double[] imagEigenvalues, ArrayRealVector[] eigenvectors)
          Build a solver from decomposed matrix.
 
Method Summary
 RealMatrix getInverse()
          Get the inverse of the decomposed matrix.
 boolean isNonSingular()
          Check if the decomposed matrix is non-singular.
 double[] solve(double[] b)
          Solve the linear equation A × X = B for symmetric matrices A.
 RealMatrix solve(RealMatrix b)
          Solve the linear equation A × X = B for symmetric matrices A.
 RealVector solve(RealVector b)
          Solve the linear equation A × X = B for symmetric matrices A.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

realEigenvalues

private double[] realEigenvalues
Real part of the realEigenvalues.


imagEigenvalues

private double[] imagEigenvalues
Imaginary part of the realEigenvalues.


eigenvectors

private final ArrayRealVector[] eigenvectors
Eigenvectors.

Constructor Detail

EigenDecompositionImpl.Solver

private EigenDecompositionImpl.Solver(double[] realEigenvalues,
                                      double[] imagEigenvalues,
                                      ArrayRealVector[] eigenvectors)
Build a solver from decomposed matrix.

Parameters:
realEigenvalues - real parts of the eigenvalues
imagEigenvalues - imaginary parts of the eigenvalues
eigenvectors - eigenvectors
Method Detail

solve

public double[] solve(double[] b)
               throws java.lang.IllegalArgumentException,
                      InvalidMatrixException
Solve the linear equation A × X = B for symmetric matrices A.

This method only find exact linear solutions, i.e. solutions for which ||A × X - B|| is exactly 0.

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
Throws:
java.lang.IllegalArgumentException - if matrices dimensions don't match
InvalidMatrixException - if decomposed matrix is singular

solve

public RealVector solve(RealVector b)
                 throws java.lang.IllegalArgumentException,
                        InvalidMatrixException
Solve the linear equation A × X = B for symmetric matrices A.

This method only find exact linear solutions, i.e. solutions for which ||A × X - B|| is exactly 0.

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
Throws:
java.lang.IllegalArgumentException - if matrices dimensions don't match
InvalidMatrixException - if decomposed matrix is singular

solve

public RealMatrix solve(RealMatrix b)
                 throws java.lang.IllegalArgumentException,
                        InvalidMatrixException
Solve the linear equation A × X = B for symmetric matrices A.

This method only find exact linear solutions, i.e. solutions for which ||A × X - B|| is exactly 0.

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
Throws:
java.lang.IllegalArgumentException - if matrices dimensions don't match
InvalidMatrixException - if decomposed matrix is singular

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

getInverse

public RealMatrix getInverse()
                      throws InvalidMatrixException
Get the inverse of the decomposed matrix.

Specified by:
getInverse in interface DecompositionSolver
Returns:
inverse matrix
Throws:
InvalidMatrixException - if decomposed matrix is singular


Copyright (c) 2003-2011 Apache Software Foundation