org.locationtech.jts.math

Class Matrix

java.lang.Object

org.locationtech.jts.math.Matrix

public class Matrix
extends java.lang.Object

Implements some 2D matrix operations (in particular, solving systems of linear equations).

Constructor Summary

Constructors

Constructor and Description
Matrix()

Method Summary

Modifier and Type	Method and Description
static double[]	solve(double[][] a, double[] b) Solves a system of equations using Gaussian Elimination.
private static void	swapRows(double[][] m, int i, int j)
private static void	swapRows(double[] m, int i, int j)

Methods inherited from class java.lang.Object

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

Constructor Detail

Matrix

public Matrix()

Method Detail

swapRows

private static void swapRows(double[][] m,
                             int i,
                             int j)

swapRows

private static void swapRows(double[] m,
                             int i,
                             int j)

solve

public static double[] solve(double[][] a,
                             double[] b)

Solves a system of equations using Gaussian Elimination. In order to avoid overhead the algorithm runs in-place on A - if A should not be modified the client must supply a copy.

Parameters:

a - an nxn matrix in row/column order )modified by this method)

b - a vector of length n

Returns:

a vector containing the solution (if any) or null if the system has no or no unique solution

Throws:

java.lang.IllegalArgumentException - if the matrix is the wrong size