Package no.uib.cipr.matrix.sparse
Class QMR
java.lang.Object
no.uib.cipr.matrix.sparse.AbstractIterativeSolver
no.uib.cipr.matrix.sparse.QMR
- All Implemented Interfaces:
IterativeSolver
Quasi-Minimal Residual method. QMR solves the unsymmetric linear system
Ax = b
using the Quasi-Minimal Residual method. QMR uses two
preconditioners, and by default these are the same preconditioner.-
Field Summary
Fields inherited from class no.uib.cipr.matrix.sparse.AbstractIterativeSolver
iter, M
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Constructor Summary
ConstructorsConstructorDescriptionConstructor for QMR.QMR
(Vector template, Preconditioner M1, Preconditioner M2) Constructor for QMR. -
Method Summary
Modifier and TypeMethodDescriptionvoid
Sets preconditionerSolves the given problem, writing result into the vector.Methods inherited from class no.uib.cipr.matrix.sparse.AbstractIterativeSolver
checkSizes, getIterationMonitor, getPreconditioner, setIterationMonitor
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Constructor Details
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QMR
Constructor for QMR. Uses the given vector as template for creating scratch vectors. Typically, the solution or the right hand side vector can be passed, and the template is not modified- Parameters:
template
- Vector to use as template for the work vectors needed in the solution process
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QMR
Constructor for QMR. Uses the given vector as template for creating scratch vectors. Typically, the solution or the right hand side vector can be passed, and the template is not modified. Allows setting different right and left preconditioners- Parameters:
template
- Vector to use as template for the work vectors needed in the solution processM1
- Left preconditionerM2
- Right preconditioner
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Method Details
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solve
Description copied from interface:IterativeSolver
Solves the given problem, writing result into the vector.- Parameters:
A
- Matrix of the problemb
- Right hand sidex
- Solution is stored here. Also used as initial guess- Returns:
- The solution vector x
- Throws:
IterativeSolverNotConvergedException
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setPreconditioner
Description copied from interface:IterativeSolver
Sets preconditioner- Specified by:
setPreconditioner
in interfaceIterativeSolver
- Overrides:
setPreconditioner
in classAbstractIterativeSolver
- Parameters:
M
- Preconditioner to use
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