/// <summary>
/// compute the similarity of case base's cases and problem case
///
/// </summary>
/// <param name="cases"></param>
/// <param name="problem"></param>
/// <returns></returns>
public ArrayList ComputeSimilarity(ArrayList cases, Case problem)
{
if (_env == null)
{
throw new ContextException("environment variable is not set");
}
ICBRContext ctx = CBRContextManager.GetCBRContext(_env);
if (ctx == null)
{
throw new ContextException("not set context");
}
ISimilarity sim = (ISimilarity)ctx.GetSimilarity();
if (sim == null)
{
throw new ContextException("similarity method is not set");
}
ArrayList stats = new ArrayList();
double similarityThrehold = ctx.GetSimilarityThrehold();
for (int i = 0; i < cases.Count; i++)
{
Case solution = (Case)cases[i];
double similarity = sim.Compare(problem, solution);
//continue if the similarity by comparing is lower than the
//similarity threhold in context setting
if (similarity < similarityThrehold)
{
continue;
}
IStat s = StatFactory.newInstance();
s.SetCBRCase(solution);
s.SetCaseSimilarity(similarity);
//bi-sort similarity
if (stats.Count <= 0)
{
stats.Add(s);
continue;
}
SortSimilarity(stats, s);
}
return(stats);
}
/// <summary>
/// test data:
/// case structure:
/// feature name feature type weight key
/// speed double 0.5 false
/// temperature double 0.3 false
/// quality double 0.2 false
/// result double 0 true
/// case 1 data:
/// speed 2.0
/// temperature 3.0
/// quality 1
/// result 1
/// case 2 data:
/// speed 3.0
/// temperature 4.0
/// quality 2
/// result 2
/// expected result value is 1 / (1 + Math.Sqrt(0.38)* 1
///
/// </summary>
[Test] public void testCompare()
{
double diff = sim.Compare(c1, c2);
Assert.AreEqual(1 / (1 + Math.Sqrt(0.38) * 1), diff);
}
