public Tuple <Vector, Vector> ConvertToVector(Dictionary <int, double> userOne, Dictionary <int, double> userTwo,
Similarity similarityType)
{
Vector vectorOne = new Vector();
Vector vectorTwo = new Vector();
// Loop through list of items rated
foreach (var item in userOne.Keys)
{
if (similarityType == Similarity.Cosine)
{
// If the item is rated by both, add to vector, else add 0 to second vector
if (userTwo.ContainsKey(item))
{
vectorOne.AddPoint(userOne[item]);
vectorTwo.AddPoint(userTwo[item]);
}
else
{
vectorOne.AddPoint(userOne[item]);
vectorTwo.AddPoint(0);
}
}
else
{
// If the item is rated by both, add to vector
if (userTwo.ContainsKey(item))
{
vectorOne.AddPoint(userOne[item]);
vectorTwo.AddPoint(userTwo[item]);
}
}
}
return(new Tuple <Vector, Vector>(vectorOne, vectorTwo));
}
public Vector Mean(List <Vector> points, int length)
{
var newVector = new Vector(length);
foreach (var vector in points)
{
for (int i = 0; i < newVector.GetPoints().Count; i++)
{
newVector.AddPoint(vector.GetPoints()[i]);
}
}
for (int i = 0; i < newVector.GetPoints().Count; i++)
{
newVector.GetPoints()[i] = (double)newVector.GetPoints()[i] / points.Count;
}
return(newVector);
}
