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java.lang.Objectcern.colt.PersistentObject
cern.jet.random.sampling.RandomSamplingAssistant
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.
RandomSampler, 
Serialized Form| Field Summary | 
| Fields inherited from class cern.colt.PersistentObject | 
| serialVersionUID | 
| Constructor Summary | |
| RandomSamplingAssistant(long n,
                        long N,
                        RandomEngine 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. | 
|  RandomEngine | 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 RandomSamplingAssistant(long n,
                               long N,
                               RandomEngine 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 PersistentObjectpublic RandomEngine 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)
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