/// <summary>
/// Returns a deep copy of the receiver.
/// </summary>
/// <returns></returns>
public override Object Clone()
{
RandomSamplingAssistant copy = (RandomSamplingAssistant)base.Clone();
copy.sampler = (RandomSampler)this.sampler.Clone();
return(copy);
}
/// <summary>
/// Just shows how this class can be used; samples n elements from and int[] array.
/// </summary>
/// <param name="n"></param>
/// <param name="elements"></param>
/// <returns></returns>
public static int[] SampleArray(int n, int[] elements)
{
RandomSamplingAssistant assistant = new RandomSamplingAssistant(n, elements.Length, null);
int[] sample = new int[n];
int j = 0;
int Length = elements.Length;
for (int i = 0; i < Length; i++)
{
if (assistant.SampleNextElement())
{
sample[j++] = elements[i];
}
}
return(sample);
}
/// <summary>
/// Tests the methods of this class.
/// To do benchmarking, comment the lines printing stuff to the console.
/// </summary>
/// <param name="n"></param>
/// <param name="N"></param>
public static void Test(long n, long N)
{
RandomSamplingAssistant assistant = new RandomSamplingAssistant(n, N, null);
List <long> sample = new List <long>((int)n);
DateTime begin = DateTime.Now;
for (long i = 0; i < N; i++)
{
if (assistant.SampleNextElement())
{
sample.Add(i);
}
}
DateTime end = DateTime.Now;
var diff = end.Subtract(begin).TotalMilliseconds;
Console.WriteLine(diff);
Console.WriteLine("sample=" + sample);
Console.WriteLine("Good bye.\n");
}
