public static Double ECosineSimilarity(string query, EQUESTION Question)
{
var QueryTerms = query.EnglishTokenize();
List <String> superset = new List <string>();
foreach (var term in QueryTerms)
{
superset.Add(term.Key);
}
foreach (EQUESTIONTERM QT in Question.EQUESTIONTERMs)
{
string temp = QT.ETERM.VALUE;
if (!superset.Contains(temp))
{
superset.Add(temp);
}
}
// normalize documents into term vectors for comparison
var vectorOne = CreateQueryFrequencyVector(superset, QueryTerms);
var vectorTwo = CreateEQuestionFrequencyVector(superset, Question);
// calculate the dot product of the two vectors ((V1[0] * V2[0]) + (V1[1] * V2[1]) ... + (V1[n] * V2[n]))
var dotProduct = DotProduct(vectorOne, vectorTwo);
// calculate the product of the vector magnatudes (Sqrt(Sum(V1) * Sum(V2)))
var productOfMagnitudes = ProductOfMagnitudes(vectorOne, vectorTwo);
// return dot product normalized by the product of magnatudes
return(dotProduct / productOfMagnitudes);
}
public ActionResult DeleteConfirmed(Guid id)
{
EQUESTION eQUESTION = db.EQUESTIONs.Find(id);
db.EQUESTIONs.Remove(eQUESTION);
db.SaveChanges();
return(RedirectToAction("Index"));
}
public ActionResult Edit([Bind(Include = "ID,VALUE,ANSWER,Indexed")] EQUESTION eQUESTION)
{
if (ModelState.IsValid)
{
eQUESTION.Indexed = 0;
db.Entry(eQUESTION).State = EntityState.Modified;
db.SaveChanges();
return(RedirectToAction("Index"));
}
return(View(eQUESTION));
}
public ActionResult Create([Bind(Include = "ID,VALUE,ANSWER,Indexed")] EQUESTION eQUESTION)
{
if (ModelState.IsValid)
{
eQUESTION.ID = Guid.NewGuid();
eQUESTION.Indexed = 0;
db.EQUESTIONs.Add(eQUESTION);
db.SaveChanges();
return(RedirectToAction("Index"));
}
return(View(eQUESTION));
}
// GET: EQUESTIONs/Delete/5
public ActionResult Delete(Guid?id)
{
if (id == null)
{
return(new HttpStatusCodeResult(HttpStatusCode.BadRequest));
}
EQUESTION eQUESTION = db.EQUESTIONs.Find(id);
if (eQUESTION == null)
{
return(HttpNotFound());
}
return(View(eQUESTION));
}
public static Double[] CreateEQuestionFrequencyVector(List <string> superset, EQUESTION Question)
{
Dictionary <string, Double> keyset = new Dictionary <string, Double>();
foreach (var key in superset)
{
keyset.Add(key, 0);
}
foreach (EQUESTIONTERM QT in Question.EQUESTIONTERMs)
{
keyset[QT.ETERM.VALUE] = Convert.ToDouble(QT.WEIGHT);
}
return(keyset.Values.ToArray());
}
