shared
Class Matrix

java.lang.Object
  |
  +--shared.Matrix

public class Matrix

extends java.lang.Object

The Matrix class contains functions useful for manipulation of double arrays in MLJ.

Constructor Summary

Matrix()

Method Summary

static double[][]	copy(double[][] matrix) Copies the double array into a new double array.
static void	initialize(double init_value, double[][] matrix) Initializes the double array to the given value.
static double	max_in_row(int row, int idx, double[][] matrix) Returns the maximum value in the specified row of the given double array.
static double	min_in_row(int row, int idx, double[][] matrix) Returns the minimum value in the specified row of the given double array.
static void	sum_cols(double[] returnRow, double[][] matrix) Sums the columns of a double array of double values and returns the sums as an array of summations.
static void	sum_rows(double[] returnColumn, double[][] matrix) Sums the rows of a double array of double values and returns the sums as an array of summations.
static double	total_sum(double[][] matrix) Sums all of the values in a double array of double values.

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

sum_cols

public static void sum_cols(double[] returnRow,
                            double[][] matrix)

Sums the columns of a double array of double values and returns the sums as an array of summations.

Parameters:

returnRow - The array containing the summations. Altered as a result of this function.

matrix - The double array containing the values to be summed.

sum_rows

public static void sum_rows(double[] returnColumn,
                            double[][] matrix)

Sums the rows of a double array of double values and returns the sums as an array of summations.

Parameters:

returnColumn - The array containing the summations. Altered as a result of this function.

matrix - The double array containing the values to be summed.

total_sum

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

Sums all of the values in a double array of double values.

Parameters:

matrix - The double array to be summed.

Returns:

The summation of all the elements in the matrix.

initialize

public static void initialize(double init_value,
                              double[][] matrix)

Initializes the double array to the given value.

Parameters:

init_value - The value to be initialized to.

matrix - The double array to be initialized.

copy

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

Copies the double array into a new double array.

Parameters:

matrix - The double array to be copied.

Returns:

The new copy of the matrix.

max_in_row

public static double max_in_row(int row,
                                int idx,
                                double[][] matrix)

Returns the maximum value in the specified row of the given double array.

Parameters:

row - The row to be searched.

idx - The index value of the greatest value.

matrix - The double array containing the row searched.

Returns:

The maximum value.

min_in_row

public static double min_in_row(int row,
                                int idx,
                                double[][] matrix)

Returns the minimum value in the specified row of the given double array.

Parameters:

row - The row to be searched.

idx - The index value of the smallest value.

matrix - The double array containing the row searched.

Returns:

The minimum value.