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java.lang.Objectno.uib.cipr.matrix.sparse.SSOR
public class SSOR
SSOR preconditioner. Uses symmetrical sucessive overrelaxation as a preconditioner. Meant for symmetrical, positive definite matrices. For best performance, omega must be carefully chosen (between 0 and 2).
Constructor Summary | |
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SSOR(CompRowMatrix F)
Constructor for SSOR. |
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SSOR(CompRowMatrix F,
boolean reverse,
double omegaF,
double omegaR)
Constructor for SSOR |
Method Summary | |
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Vector |
apply(Vector b,
Vector x)
Solves the approximate problem with the given right hand side. |
void |
setMatrix(Matrix A)
Sets the operator matrix for the preconditioner. |
void |
setOmega(double omegaF,
double omegaR)
Sets the overrelaxation parameters |
Vector |
transApply(Vector b,
Vector x)
Solves the approximate transpose problem with the given right hand side. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public SSOR(CompRowMatrix F, boolean reverse, double omegaF, double omegaR)
F
- Matrix to use internally. It will not be modified, thus the
system matrix may be passedreverse
- True to perform a reverse sweep as well as the forward sweep.
If false, this preconditioner becomes the SOR method insteadomegaF
- Overrelaxation parameter for the forward sweep. Between 0 and
2.omegaR
- Overrelaxation parameter for the backwards sweep. Between 0
and 2.public SSOR(CompRowMatrix F)
omega=1
with a backwards sweep
F
- Matrix to use internally. It will not be modified, thus the
system matrix may be passedMethod Detail |
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public void setOmega(double omegaF, double omegaR)
omegaF
- Overrelaxation parameter for the forward sweep. Between 0 and
2.omegaR
- Overrelaxation parameter for the backwards sweep. Between 0
and 2.public void setMatrix(Matrix A)
Preconditioner
setMatrix
in interface Preconditioner
A
- Matrix to setup the preconditioner for. Not modifiedpublic Vector apply(Vector b, Vector x)
Preconditioner
apply
in interface Preconditioner
b
- Right hand side of problemx
- Result is stored here
public Vector transApply(Vector b, Vector x)
Preconditioner
transApply
in interface Preconditioner
b
- Right hand side of problemx
- Result is stored here
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