- All Implemented Interfaces:
- Direct Known Subclasses:
Field SummaryModifier and TypeFieldDescription
Fields inherited from class org.ejml.dense.row.linsol.LinearSolverAbstract_ZDRM
A, numCols, numRows, stride
Method SummaryModifier and TypeMethodDescriptionIf a decomposition class was used internally then this will return that class.
(ZMatrixRMaj A_inv)Computes the inverse of of the 'A' matrix passed into
LinearSolver.setA(Matrix)and writes the results to the provided matrix.
quality()Returns a very quick to compute measure of how singular the system is.
(ZMatrixRMaj A)Specifies the A matrix in the linear equation.
Methods inherited from class org.ejml.dense.row.linsol.LinearSolverAbstract_ZDRM
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
Methods inherited from interface org.ejml.interfaces.linsol.LinearSolver
decompprotected LUDecompositionBase_ZDRM decomp
setApublic boolean setA
Specifies the A matrix in the linear equation. A reference might be saved and it might also be modified depending on the implementation. If it is modified then
LinearSolver.modifiesA()will return true.
If this value returns true that does not guarantee a valid solution was generated. This is because some decompositions don't detect singular matrices.
A- The 'A' matrix in the linear equation. Might be modified or save the reference.
- true if it can be processed.
qualitypublic double quality()
Returns a very quick to compute measure of how singular the system is. This measure will be invariant to the scale of the matrix and always be positive, with larger values indicating it is less singular. If not supported by the solver then the runtime exception IllegalArgumentException is thrown. This is NOT the matrix's condition.
How this function is implemented is not specified. One possible implementation is the following: In many decompositions a triangular matrix is extracted. The determinant of a triangular matrix is easily computed and once normalized to be scale invariant and its absolute value taken it will provide functionality described above.
- The quality of the linear system.
invertpublic void invert
(ZMatrixRMaj A_inv)Description copied from interface:
LinearSolverDenseComputes the inverse of of the 'A' matrix passed into
LinearSolver.setA(Matrix)and writes the results to the provided matrix. If 'A_inv' needs to be different from 'A' is implementation dependent.
- Specified by:
A_inv- Where the inverted matrix saved. Modified.
modifiesApublic boolean modifiesA()
- true if A is modified in setA().
modifiesBpublic boolean modifiesB()
- true if B is modified in solve(B,X).
getDecompositionpublic LUDecompositionBase_ZDRM getDecomposition()If a decomposition class was used internally then this will return that class. Most linear solvers decompose the input matrix into a more simplistic form. However some solutions do not require decomposition, e.g. inverse by minor.
- Internal decomposition class. If there is none then null.