org.apache.sysds.runtime.util

Class SortUtils

java.lang.Object

org.apache.sysds.runtime.util.SortUtils

public class SortUtils
extends Object

Utilities for sorting, primarily used for SparseRows.

Constructor Summary

Constructors

Constructor and Description
SortUtils()

Method Summary

Modifier and Type	Method and Description
static int	compare(double[] d1, double[] d2)
static boolean	isSorted(int start, int end, double[] values)
static boolean	isSorted(int start, int end, int[] indexes)
static boolean	isSorted(MatrixBlock in)
static void	sortByIndex(int start, int end, int[] indexes, double[] values) In-place sort of two arrays, only indexes is used for comparison and values of same position are sorted accordingly.
static void	sortByIndex(int start, int end, int[] indexes, int[] indexes2, double[] values) In-place sort of three arrays, only first indexes is used for comparison and second indexes as well as values of same position are sorted accordingly.
static void	sortByValue(int start, int end, double[] values, int[] indexes)
static void	sortByValueStable(int start, int end, double[] values, int[] indexes) In-place sort of two arrays, only indexes is used for comparison and values of same position are sorted accordingly.

Methods inherited from class java.lang.Object

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

Constructor Detail

SortUtils

public SortUtils()

Method Detail

isSorted

public static boolean isSorted(int start,
                               int end,
                               int[] indexes)

isSorted

public static boolean isSorted(int start,
                               int end,
                               double[] values)

isSorted

public static boolean isSorted(MatrixBlock in)

compare

public static int compare(double[] d1,
                          double[] d2)

sortByIndex

public static void sortByIndex(int start,
                               int end,
                               int[] indexes,
                               double[] values)

In-place sort of two arrays, only indexes is used for comparison and values of same position are sorted accordingly.

Parameters:

start - starting index

end - ending index

indexes - array of indexes to sort by

values - double array of values to sort

sortByIndex

public static void sortByIndex(int start,
                               int end,
                               int[] indexes,
                               int[] indexes2,
                               double[] values)

In-place sort of three arrays, only first indexes is used for comparison and second indexes as well as values of same position are sorted accordingly.

Parameters:

start - starting index

end - ending index

indexes - ?

indexes2 - ?

values - ?

sortByValue

public static void sortByValue(int start,
                               int end,
                               double[] values,
                               int[] indexes)

sortByValueStable

public static void sortByValueStable(int start,
                                     int end,
                                     double[] values,
                                     int[] indexes)

In-place sort of two arrays, only indexes is used for comparison and values of same position are sorted accordingly.

Parameters:

start - start index

end - end index

values - double array of values to sort

indexes - int array of indexes to sort by