public double EuclDW(Item item)
{
int nCount = 0;
int iIndex = 0; double nDistance = 0;
// Iterating through the array of attributes and for each pair of either users or items
// attributes computing the distance between those attributes. Then, each distance values
// is added to the nDistance variable. During the computation we're also obtaining the
// value of releavance between the lexicographical representations of those attributes
while (iIndex < item.AttributeList.Count() && iIndex < AttributeList.Count())
{
// Compute the relevance between names of the pair of attributes
double nRel = Relevance(item.AttributeList[iIndex].Name, AttributeList[iIndex].Name);
if (nRel == 1)
{
nCount++;
}
// Computing the Eucledean distance between the pair of current attributes
nDistance += Math.Pow(item.AttributeList[iIndex].Value - AttributeList[iIndex].Value, 2.0) *
((double)((nRel > 0) ? nRel : 1));
iIndex++;
}
// Returning the value of the distance between two vectors of attributes
return(Math.Sqrt(nDistance) * ((double)1 / ((nCount > 0) ? nCount : 0.01)));
}
public object Clone()
{
IAttributeList TargetAttributeList = new IAttributeList();
foreach (Attribute attribute in AttributeList)
{
TargetAttributeList.Add(attribute);
}
return(TargetAttributeList.Count() > 0 ?
(IAttributeList)TargetAttributeList.Clone() : null);
}
public object Clone()
{
IItemsList TargetItems = new IItemsList();
foreach (Item item in ItemsList)
{
IAttributeList TargetAttributeList = new IAttributeList();
foreach (Attribute attrib in item.GetAttributeList())
{
TargetAttributeList.Add(new Attribute(attrib.Name, attrib.Value));
}
if (TargetAttributeList.Count() > 0)
{
TargetItems.Add(new Item(item.ItemText, TargetAttributeList,
item.Distance, item.IsCentroid, item.Exists));
}
}
return(TargetItems);
}
public object Clone()
{
Item TargetItem = (Item)this.MemberwiseClone();
IAttributeList TargetAttributeList = new IAttributeList();
foreach (Attribute attribute in this.AttributeList)
{
TargetAttributeList.Add(attribute);
}
if (TargetAttributeList.Count() > 0)
{
TargetItem.AttributeList = (IAttributeList)TargetAttributeList.Clone();
}
TargetItem.IsCentroid = this.IsCentroid;
TargetItem.Exists = this.Exists;
TargetItem.ItemText = this.ItemText;
TargetItem.Distance = this.Distance;
return(TargetItem);
}