|
public static ComputeCorrelation ( HashSet |
||
| vector_i | HashSet |
the first vector |
| vector_j | HashSet |
the second vector |
| return | float | |
public static float ComputeCorrelation(HashSet<int> vector_i, HashSet<int> vector_j)
{
int cntr = 0;
foreach (int k in vector_j)
if (vector_i.Contains(k))
cntr++;
return (float) cntr / (float) Math.Sqrt(vector_i.Count * vector_j.Count);
}
[Test()] public void TestComputeCorrelation()
{
var vector1 = new HashSet<int>();
vector1.Add(0);
vector1.Add(2);
vector1.Add(4);
var vector2 = new HashSet<int>();
vector2.Add(1);
vector2.Add(3);
vector2.Add(4);
var cosine = new BinaryCosine(4);
Assert.AreEqual(1 / 3f, cosine.ComputeCorrelation(vector1, vector2), DELTA);
Assert.AreEqual(0f, cosine.ComputeCorrelation(vector1, new HashSet<int>()), DELTA);
}
