cc.redberry.rings.util

Class RandomUtil

java.lang.Object

cc.redberry.rings.util.RandomUtil

public final class RandomUtil
extends Object

Since:

1.0

Method Summary

Modifier and Type	Method and Description
static BigInteger[]	randomBigIntegerArray(int length, BigInteger min, BigInteger max, org.apache.commons.math3.random.RandomGenerator rnd) Creates random array of length degree + 1 with elements bounded by bound (by absolute value).
static BigInteger	randomInt(BigInteger bound, org.apache.commons.math3.random.RandomGenerator rnd) Returns random integer in range [0, bound).
static int[]	randomIntArray(int length, int min, int max, org.apache.commons.math3.random.RandomGenerator rnd) Creates random array of length degree + 1 with elements bounded by bound (by absolute value).
static long[]	randomLongArray(int length, long min, long max, org.apache.commons.math3.random.RandomGenerator rnd) Creates random array of length degree + 1 with elements bounded by bound (by absolute value).
static int[]	randomSharpIntArray(int length, int total, org.apache.commons.math3.random.RandomGenerator rnd) Creates random array of length degree + 1 with elements bounded by bound (by absolute value).

Methods inherited from class java.lang.Object

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

Method Detail

randomIntArray

public static int[] randomIntArray(int length,
                                   int min,
                                   int max,
                                   org.apache.commons.math3.random.RandomGenerator rnd)

Creates random array of length degree + 1 with elements bounded by bound (by absolute value).

Parameters:

length - array length

min - min value

max - max value

rnd - random source

Returns:

array of length length with elements bounded by bound (by absolute value)

randomSharpIntArray

public static int[] randomSharpIntArray(int length,
                                        int total,
                                        org.apache.commons.math3.random.RandomGenerator rnd)

Creates random array of length degree + 1 with elements bounded by bound (by absolute value).

Parameters:

length - array length

total - total

rnd - random source

Returns:

array of length length with elements bounded by bound (by absolute value)

randomLongArray

public static long[] randomLongArray(int length,
                                     long min,
                                     long max,
                                     org.apache.commons.math3.random.RandomGenerator rnd)

Creates random array of length degree + 1 with elements bounded by bound (by absolute value).

Parameters:

length - array length

min - min value

max - max value

rnd - random source

Returns:

array of length length with elements bounded by bound (by absolute value)

randomBigIntegerArray

public static BigInteger[] randomBigIntegerArray(int length,
                                                 BigInteger min,
                                                 BigInteger max,
                                                 org.apache.commons.math3.random.RandomGenerator rnd)

Creates random array of length degree + 1 with elements bounded by bound (by absolute value).

Parameters:

length - array length

min - min value

max - max value

rnd - random source

Returns:

array of length length with elements bounded by bound (by absolute value)

randomInt

public static BigInteger randomInt(BigInteger bound,
                                   org.apache.commons.math3.random.RandomGenerator rnd)

Returns random integer in range [0, bound).

Parameters:

bound - maximal allowed value

rnd - random

Returns:

a BigInteger b so that 0 <= b < bound