Module com.marginallyclever.robotoverlord

Package com.marginallyclever.convenience.helpers

Class BigMatrixHelper

java.lang.Object

com.marginallyclever.convenience.helpers.BigMatrixHelper

public abstract class BigMatrixHelper
extends Object

Constructor Summary

Constructors

Constructor	Description
BigMatrixHelper()

Method Summary

Modifier and Type	Method	Description
static double[][]	createMatrix(int rows, int cols)
static double	determinant(double[][] matrix)	Method that calculates determinant of given matrix
static double[][]	invert(double[][] a)	invert an N*N matrix.
static double[]	matrix4dToArray(javax.vecmath.Matrix4d m)	Convert a Matrix4d to an array of doubles.
static double[][]	minor(double[][] matrix, int row, int column)	Method that creates minor of given matrix
static double[]	multiply(double[][] a, double[] x)	matrix-vector multiplication (y = A * x)
static double[][]	multiplyMatrices(double[][] x, double[][] y)	Method that multiplies two matrices and returns the result
static void	printMatrix(double[][] matrix)	Method that prints matrix
static double[][]	transpose(double[][] matrix)

Methods inherited from class java.lang.Object

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

Constructor Details

BigMatrixHelper

public BigMatrixHelper()

Method Details

invert

public static double[][] invert(double[][] a)

invert an N*N matrix. See ...

Parameters:

a - the matrix to invert.

Returns:

the result.

transpose

public static double[][] transpose(double[][] matrix)

determinant

public static double determinant(double[][] matrix)

Method that calculates determinant of given matrix

Parameters:

matrix - matrix of which we need to know determinant

Returns:

determinant of given matrix

minor

public static double[][] minor(double[][] matrix,
 int row,
 int column)

Method that creates minor of given matrix

Parameters:

matrix - matrix of which we need to create minor

row - row of element to exclude

column - column of element to exclude

Returns:

minor of given matrix

multiplyMatrices

public static double[][] multiplyMatrices(double[][] x,
 double[][] y)

Method that multiplies two matrices and returns the result

Parameters:

x - first matrix

y - second matrix

Returns:

result after multiplication

multiply

public static double[] multiply(double[][] a,
 double[] x)

matrix-vector multiplication (y = A * x)

Parameters:

a - matrix

x - vector

Returns:

result of multiplication

printMatrix

public static void printMatrix(double[][] matrix)

Method that prints matrix

Parameters:

matrix - matrix to print

createMatrix

public static double[][] createMatrix(int rows,
 int cols)

matrix4dToArray

public static double[] matrix4dToArray(javax.vecmath.Matrix4d m)

Convert a Matrix4d to an array of doubles. Matrix4d is row-major and OpenGL is column-major.

Parameters:

m - the matrix to convert

Returns:

a double array of length 16