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.AttribList.Count() && iIndex < AttribList.Count())
{
// Compute the relevance between names of the pair of attributes
double nRel = Relevance(item.AttribList[iIndex].Name, AttribList[iIndex].Name);
if (nRel == 1)
{
nCount++;
}
// Computing the Eucledean distance between the pair of current attributes
nDistance += Math.Pow(item.AttribList[iIndex].Value - AttribList[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 void AppendTag(string tagname, AttribList attribs, Action cb)
{
int curlevel = m_indcnt;
BeginTag(tagname, attribs, (cb == null));
if (cb != null)
{
if (m_doindent)
{
m_buf.Append("\n");
}
cb();
if (m_doindent)
{
WriteIndent(curlevel);
}
EndTag(tagname);
}
}
private void BeginTag(string tagname, AttribList attribs, bool isempty = false)
{
BeginIndent();
m_buf.AppendFormat("<{0}", tagname);
WriteAttribs(attribs);
if (isempty)
{
m_buf.Append(" />");
if (m_doindent)
{
m_buf.Append("\n");
}
EndIndent();
}
else
{
m_buf.Append(">");
}
}
private void WriteAttribs(AttribList attribs)
{
int icount = attribs.Count;
bool islast = false;
if (attribs.Count > 0)
{
m_buf.Append(" ");
foreach (var kvp in attribs)
{
icount--;
islast = (icount == 0);
m_buf.AppendFormat("{0}=\"{1}\"", kvp.Key, kvp.Value);
if (!islast)
{
m_buf.Append(" ");
}
}
}
}
public void AppendTag(string tagname, AttribList attribs, string content)
{
int curlevel = m_indcnt;
bool isempty = (String.IsNullOrEmpty(content));
bool needsindent = (m_doindent && (content.IndexOf("\n") > -1));
BeginTag(tagname, attribs, isempty);
if (isempty == false)
{
if (needsindent)
{
int i;
var lines = content.Replace("\r", "").Trim().Split('\n');
for (i = 0; i < lines.Length; i++)
{
var line = lines[i].Trim();
WriteIndent(m_indcnt);
m_buf.Append(line);
if ((i + 1) != lines.Length)
{
m_buf.Append("\n");
}
}
m_buf.Append("\n");
}
else
{
m_buf.Append(content.Trim());
}
if (m_doindent)
{
if (needsindent)
{
WriteIndent(curlevel);
}
}
EndTag(tagname);
}
}
public void t(string tagname, AttribList attribs, string content)
{
AppendTag(tagname, attribs, content);
}
public void t(string tagname, AttribList attribs)
{
AppendTag(tagname, attribs);
}
public void t(string tagname, AttribList attribs, Action cb)
{
AppendTag(tagname, attribs, cb);
}
public void AppendTag(string tagname, AttribList attribs)
{
AppendTag(tagname, attribs, (Action)null);
}
