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VectorSample Method (Int32, UInt64)
Returns a vector of the specified sampleSize containing non-repeating indices in the range [0, populationSize) in random order.

Namespace:  Accord.Math
Assembly:  Accord.Math (in Accord.Math.dll) Version: 3.8.0
Syntax
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public static ulong[] Sample(
	int sampleSize,
	ulong populationSize
)
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Parameters

sampleSize
Type: SystemInt32
The size of the sample vector to be generated.
populationSize
Type: SystemUInt64
The non-inclusive maximum number an index can have.

Return Value

Type: UInt64
Remarks
In other words, this return a sample of size k from a population of size N, where k is the parameter sampleSize and N is the parameter populationSize.
Examples
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var a = Vector.Sample(3, 10);  // a possible output is { 1, 7, 4 };
var b = Vector.Sample(10, 10); // a possible output is { 5, 4, 2, 0, 1, 3, 7, 9, 8, 6 };

foreach (var i in Vector.Sample(5, 6))
{
   // ...
}
See Also