|
Parallel Colt 0.9.4 | |||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
java.lang.Objectcern.colt.PersistentObject
cern.jet.random.tfloat.sampling.FloatRandomSamplingAssistant
public class FloatRandomSamplingAssistant
Conveniently computes a stable Simple Random Sample Without Replacement (SRSWOR) subsequence of n elements from a given input sequence of N elements; Example: Computing a sublist of n=3 random elements from a list (1,...,50) may yield the sublist (7,13,47). The subsequence is guaranteed to be stable, i.e. elements never change position relative to each other. Each element from the N elements has the same probability to be included in the n chosen elements. This class is a convenience adapter for RandomSampler using blocks.
FloatRandomSampler
,
Serialized FormConstructor Summary | |
---|---|
FloatRandomSamplingAssistant(long n,
long N,
FloatRandomEngine randomGenerator)
Constructs a random sampler that samples n random elements from an input sequence of N elements. |
Method Summary | |
---|---|
Object |
clone()
Returns a deep copy of the receiver. |
FloatRandomEngine |
getRandomGenerator()
Returns the used random generator. |
static void |
main(String[] args)
Tests random sampling. |
static int[] |
sampleArray(int n,
int[] elements)
Just shows how this class can be used; samples n elements from and int[] array. |
boolean |
sampleNextElement()
Returns whether the next element of the input sequence shall be sampled (picked) or not. |
static void |
test(long n,
long N)
Tests the methods of this class. |
static void |
testArraySampling(int n,
int N)
Tests the methods of this class. |
Methods inherited from class java.lang.Object |
---|
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
---|
public FloatRandomSamplingAssistant(long n, long N, FloatRandomEngine randomGenerator)
n
- the total number of elements to choose (must be >= 0).N
- number of elements to choose from (must be >= n).randomGenerator
- a random number generator. Set this parameter to null
to use the default random number generator.Method Detail |
---|
public Object clone()
clone
in class PersistentObject
public FloatRandomEngine getRandomGenerator()
public static void main(String[] args)
public static int[] sampleArray(int n, int[] elements)
public boolean sampleNextElement()
public static void test(long n, long N)
public static void testArraySampling(int n, int N)
|
Parallel Colt 0.9.4 | |||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | |||||||||
SUMMARY: NESTED | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |