Package no.uib.cipr.matrix
Class SymmBandEVD
java.lang.Object
no.uib.cipr.matrix.SymmBandEVD
Computes eigenvalues of symmetrical, banded matrices
-
Constructor Summary
ConstructorsConstructorDescriptionSymmBandEVD
(int n, boolean upper) Sets up an eigenvalue decomposition for symmetrical, banded matrices.SymmBandEVD
(int n, boolean upper, boolean vectors) Sets up an eigenvalue decomposition for symmetrical, banded matrices -
Method Summary
Modifier and TypeMethodDescriptionComputes the eigenvalue decomposition of the given matrixComputes the eigenvalue decomposition of the given matrixstatic SymmBandEVD
Convenience method for computing the full eigenvalue decomposition of the given matrixdouble[]
Gets the eigenvalues (stored in ascending order)Gets the eigenvectors, if availableboolean
True if the eigenvectors have been computed
-
Constructor Details
-
SymmBandEVD
public SymmBandEVD(int n, boolean upper) Sets up an eigenvalue decomposition for symmetrical, banded matrices. Computes all eigenvalues and eigenvectors- Parameters:
n
- Size of the matrixupper
- True if the upper part of the matrix is stored, and false if the lower part of the matrix is stored instead
-
SymmBandEVD
public SymmBandEVD(int n, boolean upper, boolean vectors) Sets up an eigenvalue decomposition for symmetrical, banded matrices- Parameters:
n
- Size of the matrixupper
- True if the upper part of the matrix is stored, and false if the lower part of the matrix is stored insteadvectors
- True to compute the eigenvectors, false for just the eigenvalues
-
-
Method Details
-
factorize
Convenience method for computing the full eigenvalue decomposition of the given matrix- Parameters:
A
- Matrix to factorize. The upper triangular part is extracted, and the matrix is not modifiedkd
- Number of diagonals to extract- Returns:
- Newly allocated decomposition
- Throws:
NotConvergedException
-
factor
Computes the eigenvalue decomposition of the given matrix- Parameters:
A
- Matrix to factorize. Overwritten on return- Returns:
- The current eigenvalue decomposition
- Throws:
NotConvergedException
-
factor
Computes the eigenvalue decomposition of the given matrix- Parameters:
A
- Matrix to factorize. Overwritten on return- Returns:
- The current eigenvalue decomposition
- Throws:
NotConvergedException
-
getEigenvalues
public double[] getEigenvalues()Gets the eigenvalues (stored in ascending order) -
getEigenvectors
Gets the eigenvectors, if available -
hasEigenvectors
public boolean hasEigenvectors()True if the eigenvectors have been computed
-