org.apache.commons.math.linear
private static class QRDecompositionImpl.Solver extends java.lang.Object implements DecompositionSolver
Modifier and Type | Field and Description |
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private double[][] |
qrt
A packed TRANSPOSED representation of the QR decomposition.
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private double[] |
rDiag
The diagonal elements of R.
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Modifier | Constructor and Description |
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private |
QRDecompositionImpl.Solver(double[][] qrt,
double[] rDiag)
Build a solver from decomposed matrix.
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Modifier and Type | Method and Description |
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RealMatrix |
getInverse()
Get the inverse (or pseudo-inverse) of the decomposed matrix.
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boolean |
isNonSingular()
Check if the decomposed matrix is non-singular.
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ArrayRealVector |
solve(ArrayRealVector b)
Solve the linear equation A × X = B.
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double[] |
solve(double[] b)
Solve the linear equation A × X = B for matrices A.
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RealMatrix |
solve(RealMatrix b)
Solve the linear equation A × X = B for matrices A.
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RealVector |
solve(RealVector b)
Solve the linear equation A × X = B for matrices A.
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private final double[][] qrt
The elements BELOW the diagonal are the elements of the UPPER triangular matrix R, and the rows ABOVE the diagonal are the Householder reflector vectors from which an explicit form of Q can be recomputed if desired.
private final double[] rDiag
private QRDecompositionImpl.Solver(double[][] qrt, double[] rDiag)
qrt
- packed TRANSPOSED representation of the QR decompositionrDiag
- diagonal elements of Rpublic boolean isNonSingular()
isNonSingular
in interface DecompositionSolver
public double[] solve(double[] b) throws java.lang.IllegalArgumentException, InvalidMatrixException
The A matrix is implicit, it is provided by the underlying decomposition algorithm.
solve
in interface DecompositionSolver
b
- right-hand side of the equation A × X = Bjava.lang.IllegalArgumentException
- if matrices dimensions don't matchInvalidMatrixException
- if decomposed matrix is singularpublic RealVector solve(RealVector b) throws java.lang.IllegalArgumentException, InvalidMatrixException
The A matrix is implicit, it is provided by the underlying decomposition algorithm.
solve
in interface DecompositionSolver
b
- right-hand side of the equation A × X = Bjava.lang.IllegalArgumentException
- if matrices dimensions don't matchInvalidMatrixException
- if decomposed matrix is singularpublic ArrayRealVector solve(ArrayRealVector b) throws java.lang.IllegalArgumentException, InvalidMatrixException
The A matrix is implicit here. It is
b
- right-hand side of the equation A × X = Bjava.lang.IllegalArgumentException
- if matrices dimensions don't matchInvalidMatrixException
- if decomposed matrix is singularpublic RealMatrix solve(RealMatrix b) throws java.lang.IllegalArgumentException, InvalidMatrixException
The A matrix is implicit, it is provided by the underlying decomposition algorithm.
solve
in interface DecompositionSolver
b
- right-hand side of the equation A × X = Bjava.lang.IllegalArgumentException
- if matrices dimensions don't matchInvalidMatrixException
- if decomposed matrix is singularpublic RealMatrix getInverse() throws InvalidMatrixException
getInverse
in interface DecompositionSolver
InvalidMatrixException
- if decomposed matrix is singularCopyright (c) 2003-2016 Apache Software Foundation