public class HessenbergTransformer extends Object
A m × m matrix A can be written as the product of three matrices: A = P × H × PT with P an orthogonal matrix and H a Hessenberg matrix. Both P and H are m × m matrices.
Transformation to Hessenberg form is often not a goal by itself, but it is an
intermediate step in more general decomposition algorithms like
eigen decomposition
. This class is therefore
intended for internal use by the library and is not public. As a consequence
of this explicitly limited scope, many methods directly returns references to
internal arrays, not copies.
This class is based on the method orthes in class EigenvalueDecomposition from the JAMA library.
Constructor and Description |
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HessenbergTransformer(RealMatrix matrix)
Build the transformation to Hessenberg form of a general matrix.
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Modifier and Type | Method and Description |
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RealMatrix |
getH()
Returns the Hessenberg matrix H of the transform.
|
RealMatrix |
getP()
Returns the matrix P of the transform.
|
RealMatrix |
getPT()
Returns the transpose of the matrix P of the transform.
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public HessenbergTransformer(RealMatrix matrix)
matrix
- matrix to transformMathIllegalArgumentException
- if the matrix is not squarepublic RealMatrix getP()
P is an orthogonal matrix, i.e. its inverse is also its transpose.
public RealMatrix getPT()
P is an orthogonal matrix, i.e. its inverse is also its transpose.
public RealMatrix getH()
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