Class Matrices

java.lang.Object
org.apache.commons.geometry.euclidean.internal.Matrices
public final class Matrices extends Object
This class consists exclusively of static matrix utility methods.

  • Method Summary

    Modifier and Type
    Method
    Description
    static double
    checkDeterminantForInverse(double det)
    Check that the given determinant is valid for use in calculating a matrix inverse.
    static double
    checkElementForInverse(double element)
    Check that the given matrix element is valid for use in calculation of a matrix inverse, throwing an IllegalStateException if not.
    static double
    determinant(double a00, double a01, double a10, double a11)
    Compute the determinant of the 2x2 matrix represented by the given values.
    static double
    determinant(double a00, double a01, double a02, double a10, double a11, double a12, double a20, double a21, double a22)
    Compute the determinant of the 3x3 matrix represented by the given values.

    Methods inherited from class Object

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

  • Method Details

    • determinant

      public static double determinant(double a00, double a01, double a10, double a11)
      Compute the determinant of the 2x2 matrix represented by the given values. The values are listed in row-major order.
      Parameters:
      a00 - matrix entry a0,0
      a01 - matrix entry a0,1
      a10 - matrix entry a1,0
      a11 - matrix entry a1,1
      Returns:
      computed 2x2 matrix determinant

    • determinant

      public static double determinant(double a00, double a01, double a02, double a10, double a11, double a12, double a20, double a21, double a22)
      Compute the determinant of the 3x3 matrix represented by the given values. The values are listed in row-major order.
      Parameters:
      a00 - matrix entry a0,0
      a01 - matrix entry a0,1
      a02 - matrix entry a0,2
      a10 - matrix entry a1,0
      a11 - matrix entry a1,1
      a12 - matrix entry a1,2
      a20 - matrix entry a2,0
      a21 - matrix entry a2,1
      a22 - matrix entry a2,2
      Returns:
      computed 3x3 matrix determinant

    • checkDeterminantForInverse

      public static double checkDeterminantForInverse(double det)
      Check that the given determinant is valid for use in calculating a matrix inverse. An IllegalStateException is thrown if the determinant is NaN, infinite, or zero.
      Parameters:
      det - the determinant to check
      Returns:
      the checked determinant
      Throws:
      IllegalStateException - if the matrix determinant value is NaN, infinite, or zero

    • checkElementForInverse

      public static double checkElementForInverse(double element)
      Check that the given matrix element is valid for use in calculation of a matrix inverse, throwing an IllegalStateException if not.
      Parameters:
      element - matrix entry to check
      Returns:
      the checked element
      Throws:
      IllegalStateException - if the element is not valid for use in calculating a matrix inverse, ie if it is NaN or infinite.