Package no.uib.cipr.matrix.sparse

Class ILU

  • All Implemented Interfaces:
    Preconditioner
    public class ILU
extends java.lang.Object
implements Preconditioner
    ILU(0) preconditioner using a compressed row matrix as internal storage

    • Constructor Summary

      Constructors 
      Constructor Description
      ILU​(CompRowMatrix LU)
      Sets up the ILU preconditioner

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      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.
      Vector transApply​(Vector b, Vector x)
      Solves the approximate transpose problem with the given right hand side.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Constructor Detail

      • ILU

        public ILU​(CompRowMatrix LU)
        Sets up the ILU preconditioner
        Parameters:
        LU - Matrix to use internally. For best performance, its non-zero pattern must conform to that of the system matrix

    • Method Detail

      • apply

        public Vector apply​(Vector b,
                    Vector x)
        Description copied from interface: Preconditioner
        Solves the approximate problem with the given right hand side. Result is stored in given solution vector
        Specified by:
        apply in interface Preconditioner
        Parameters:
        b - Right hand side of problem
        x - Result is stored here
        Returns:
        x

      • transApply

        public Vector transApply​(Vector b,
                         Vector x)
        Description copied from interface: Preconditioner
        Solves the approximate transpose problem with the given right hand side. Result is stored in given solution vector
        Specified by:
        transApply in interface Preconditioner
        Parameters:
        b - Right hand side of problem
        x - Result is stored here
        Returns:
        x

      • setMatrix

        public void setMatrix​(Matrix A)
        Description copied from interface: Preconditioner
        Sets the operator matrix for the preconditioner. This method must be called before a preconditioner is used by an iterative solver
        Specified by:
        setMatrix in interface Preconditioner
        Parameters:
        A - Matrix to setup the preconditioner for. Not modified