hex.genmodel.utils

Class ArrayUtils

java.lang.Object

hex.genmodel.utils.ArrayUtils

public class ArrayUtils
extends java.lang.Object

Copied (partially) from water.util.ArrayUtils

Constructor Summary

Constructors

Constructor and Description
ArrayUtils()

Method Summary

Modifier and Type	Method and Description
static int[]	append(int[] a, int... b)
static java.lang.String[][]	append(java.lang.String[][] a, java.lang.String[]... b)
static java.lang.String[]	append(java.lang.String[] a, java.lang.String... b)
static int[]	arrayInitRange(int arrayLen, int startIndex)
static double[]	difference(double[] array)
static double[]	eleDiff(double[] from)
static double[]	flat(double[][] arr)
static boolean	isBoolColumn(java.lang.String[] domains) Check to see if a column is a boolean column.
static double	l2norm(double[] x)
static double	l2norm2(double[] x)
static double	l2norm2(double[] x, boolean skipLast)
static int	maxIndex(double[] from)
static int	maxIndex(double[] from, java.util.Random rand)
static double[]	mult(double[] nums, double n)
static void	multArray(double[] a, double[][] bT, double[] result) Carry out multiplication of row array a and matrix b and store the result in result array.
static double[]	nanArray(int len)
static int[]	range(int start, int end) Provide array from start to end in steps of 1
static double[]	signum(double[] array)
static void	sort(int[] idxs, double[] values) Sort an integer array of indices based on values Updates indices in place, keeps values the same
static void	sort(int[] idxs, double[] values, int cutoff)
static void	sort(int[] idxs, float[] values, int fromIndex, int toIndex, boolean abs, int increasing) Sort an integer array of indices based on values Updates indices in place, keeps values the same
static void	sort(int[] idxs, float[] values, int fromIndex, int toIndex, boolean abs, int increasing, int cutoff)
static double	subAndMul(double[] data, double[] p, double[] n)
static int[]	subtract(int[] from, int val)
static int[]	subtract(int[] from, int[] val)

Methods inherited from class java.lang.Object

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

Constructor Detail

ArrayUtils

public ArrayUtils()

Method Detail

nanArray

public static double[] nanArray(int len)

l2norm

public static double l2norm(double[] x)

l2norm2

public static double l2norm2(double[] x)

l2norm2

public static double l2norm2(double[] x,
                             boolean skipLast)

flat

public static double[] flat(double[][] arr)

eleDiff

public static double[] eleDiff(double[] from)

subtract

public static int[] subtract(int[] from,
                             int val)

subtract

public static int[] subtract(int[] from,
                             int[] val)

mult

public static double[] mult(double[] nums,
                            double n)

arrayInitRange

public static int[] arrayInitRange(int arrayLen,
                                   int startIndex)

isBoolColumn

public static boolean isBoolColumn(java.lang.String[] domains)

Check to see if a column is a boolean column. A boolean column should contains only two levels and the string describing the domains should be true/false

Parameters:

domains -

Returns:

maxIndex

public static int maxIndex(double[] from,
                           java.util.Random rand)

maxIndex

public static int maxIndex(double[] from)

sort

public static void sort(int[] idxs,
                        double[] values)

Sort an integer array of indices based on values Updates indices in place, keeps values the same

Parameters:

idxs - indices

values - values

sort

public static void sort(int[] idxs,
                        double[] values,
                        int cutoff)

sort

public static void sort(int[] idxs,
                        float[] values,
                        int fromIndex,
                        int toIndex,
                        boolean abs,
                        int increasing)

Sort an integer array of indices based on values Updates indices in place, keeps values the same

Parameters:

idxs - indices

values - values

sort

public static void sort(int[] idxs,
                        float[] values,
                        int fromIndex,
                        int toIndex,
                        boolean abs,
                        int increasing,
                        int cutoff)

append

public static java.lang.String[] append(java.lang.String[] a,
                                        java.lang.String... b)

append

public static java.lang.String[][] append(java.lang.String[][] a,
                                          java.lang.String[]... b)

append

public static int[] append(int[] a,
                           int... b)

signum

public static double[] signum(double[] array)

difference

public static double[] difference(double[] array)

multArray

public static void multArray(double[] a,
                             double[][] bT,
                             double[] result)

Carry out multiplication of row array a and matrix b and store the result in result array. However the transpose of the matrix is given.

Parameters:

a -

bT -

result -

range

public static int[] range(int start,
                          int end)

Provide array from start to end in steps of 1

Parameters:

start - beginning value (inclusive)

end - ending value (inclusive)

Returns:

specified range of integers

subAndMul

public static double subAndMul(double[] data,
                               double[] p,
                               double[] n)

Parameters:

data - vector (1 x n)

p - vector (1 x n)

n - vector (1 x n)

Returns:

Result of matrix operation (data - p) * n