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java.lang.Objectcern.colt.matrix.tfloat.algo.solver.preconditioner.FloatSSOR
public class FloatSSOR
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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FloatSSOR(int n)
Constructor for SSOR. |
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FloatSSOR(int n,
boolean reverse,
float omegaF,
float omegaR)
Constructor for SSOR |
Method Summary | |
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FloatMatrix1D |
apply(FloatMatrix1D b,
FloatMatrix1D x)
Solves the approximate problem with the given right hand side. |
void |
setMatrix(FloatMatrix2D A)
Sets the operator matrix for the preconditioner. |
void |
setOmega(float omegaF,
float omegaR)
Sets the overrelaxation parameters |
FloatMatrix1D |
transApply(FloatMatrix1D b,
FloatMatrix1D x)
Solves the approximate transpose problem with the given right hand side. |
Methods inherited from class java.lang.Object |
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equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public FloatSSOR(int n, boolean reverse, float omegaF, float omegaR)
n
- Problem size (number of rows)reverse
- 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 FloatSSOR(int n)
omega=1
with a backwards sweep
n
- Problem size (number of rows)Method Detail |
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public void setOmega(float omegaF, float 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(FloatMatrix2D A)
FloatPreconditioner
setMatrix
in interface FloatPreconditioner
A
- Matrix to setup the preconditioner for. Not modifiedpublic FloatMatrix1D apply(FloatMatrix1D b, FloatMatrix1D x)
FloatPreconditioner
apply
in interface FloatPreconditioner
b
- Right hand side of problemx
- Result is stored here
public FloatMatrix1D transApply(FloatMatrix1D b, FloatMatrix1D x)
FloatPreconditioner
transApply
in interface FloatPreconditioner
b
- Right hand side of problemx
- Result is stored here
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