Package org.esa.snap.core.util.math

Class LinEqSysSolver

java.lang.Object
org.esa.snap.core.util.math.LinEqSysSolver
public class LinEqSysSolver extends Object
A gauss-based solver for linear equation systems.

  • Constructor Summary

    Constructors
    Constructor
    Description
    LinEqSysSolver()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    static boolean
    gauss(double[][] a, double[] c, double[] x, int n, double eps)
    Solves a linear equation system using the gaussian algorithm.
    static boolean
    gauss_debug(double[][] a, double[] c, double[] x, int n, double eps)
    Same as the gausss method, but prints extra debug information.
    static boolean
    pivotize(double[][] a, double[] c, int k, int n, double eps)
    Rearranges the matrix a by swapping line k with a suitable pivot line k'.

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • LinEqSysSolver

      public LinEqSysSolver()

  • Method Details

    • gauss

      public static boolean gauss(double[][] a, double[] c, double[] x, int n, double eps) throws SingularMatrixException
      Solves a linear equation system using the gaussian algorithm.
      Parameters:
      a - coefficient matrix [0..n-1][0..n-1] (left side of equation)
      c - the constant vector [0..n-1] (right side of equation)
      x - the result vector [0..n-1] (right side of equation)
      n - number of coefficients
      eps - the epsilon value, e.g. 1.0e-09
      Throws:
      SingularMatrixException - if the matrix a is singular

    • gauss_debug

      public static boolean gauss_debug(double[][] a, double[] c, double[] x, int n, double eps)
      Same as the gausss method, but prints extra debug information.
      Parameters:
      a - coefficient matrix [0..n-1][0..n-1] (left side of equation)
      c - the constant vector [0..n-1] (right side of equation)
      x - the result vector [0..n-1] (right side of equation)
      n - number of coefficients
      eps - the epsilon value, e.g. 1.0e-09
      Throws:
      SingularMatrixException - if the matrix a is singular
      See Also:

    • pivotize

      public static boolean pivotize(double[][] a, double[] c, int k, int n, double eps)
      Rearranges the matrix a by swapping line k with a suitable pivot line k'.
      Parameters:
      a - coefficient matrix [0..n-1][0..n-1] (left side of equation)
      c - the constant vector [0..n-1] (right side of equation)
      k - the current index of a diagonal element = current line and column
      n - matrix size
      eps - the epsilon value, e.g. 1.0e-09
      Throws:
      SingularMatrixException - if the matrix a is singular