public QGramSet <T> Union(QGramSet <T> set)
{
var newQgramSet = new QGramSet <T>(this);
foreach (var pair in set)
{
int frequency;
newQgramSet.TryGetValue(pair.Key, out frequency);
newQgramSet[pair.Key] = Math.Max(pair.Value, frequency);
}
return(newQgramSet);
}
public QGramSet <T> Intersect(QGramSet <T> set)
{
var newQgramSet = new QGramSet <T>();
foreach (var pair in set)
{
int frequency;
if (TryGetValue(pair.Key, out frequency))
{
newQgramSet.Add(pair.Key, Math.Min(pair.Value, frequency));
}
}
return(newQgramSet);
}