/// <summary>
/// Инициализирует новый экземпляр класса <see cref="FuzzyCartesianProduct"/>.
/// </summary>
/// <param name="left">Первое множество.</param>
/// <param name="right">Второе множество.</param>
/// <param name="type">Тип операции.</param>
public FuzzyCartesianProduct(NFuzzySet left, NFuzzySet right, OperationType type = OperationType.MinMax)
{
this.left = left;
this.right = right;
this.xmax = UnionMaximum();
this.xmin = UnionMinimum();
switch (type)
{
case (OperationType.MinMax):
function = (x) =>
{
var args = SplitArgs(x);
return(Math.Min(left.GetConfidence(args.Item1), right.GetConfidence(args.Item2)));
};
break;
case (OperationType.MinMaxAlternative):
function = (x) =>
{
var args = SplitArgs(x);
return(Math.Max(left.GetConfidence(args.Item1), right.GetConfidence(args.Item2)));
};
break;
default:
function = (x) =>
{
var args = SplitArgs(x);
return(Math.Max(left.GetConfidence(args.Item1), right.GetConfidence(args.Item2)));
};
break;
}
}
protected double[] Maximum(NFuzzySet set)
{
double[] max = new double[xmin.Length];
for (int i = 0; i < xmax.Length; i++)
{
max[i] = Math.Min(xmax[i], set.xmax[i]);
}
return(max);
}
protected double[] Minimum(NFuzzySet set)
{
double[] min = new double[xmin.Length];
for (int i = 0; i < xmin.Length; i++)
{
min[i] = Math.Min(xmin[i], set.xmin[i]);
}
return(min);
}
/// <summary>
/// Возвращает объединение нечётких множеств.
/// </summary>
/// <param name="set">Второе множество.</param>
/// <param name="type">Тип операции объединения.</param>
/// <returns>Возвращает объединение нечётких множеств.</returns>
public NFuzzySet Union(NFuzzySet set, OperationType type = OperationType.MinMax)
{
double[] newXMin = Minimum(set);
double[] newXMax = Maximum(set);
NFunction func;
switch (type)
{
case (OperationType.MinMax):
func = (x) => Math.Max(this.GetConfidence(x), set.GetConfidence(x));
break;
case (OperationType.Algebraic):
func = (x) => this.GetConfidence(x) + set.GetConfidence(x) -
this.GetConfidence(x) * set.GetConfidence(x);
break;
case (OperationType.Conditional):
func = (x) =>
{
double y1 = this.GetConfidence(x);
double y2 = set.GetConfidence(x);
if (y2 == 0)
{
return(y1);
}
else if (y1 == 0)
{
return(y2);
}
else
{
return(1);
}
};
break;
case (OperationType.MinMaxAlternative):
func = (x) => Math.Min(1, this.GetConfidence(x) + set.GetConfidence(x));
break;
case (OperationType.Exponential):
func = (x) => Math.Min(1, Math.Pow(Math.Pow(this.GetConfidence(x), 2) +
Math.Pow(set.GetConfidence(x), 2), 1.0 / 2));
break;
default:
func = (x) => 0;
break;
}
return(new NFuzzySet(func, newXMin, newXMax));
}
/// <summary>
/// Возвращает декартово произведение заданных множеств.
/// </summary>
/// <param name="set">Второе множество.</param>
/// <param name="type">Тип операции.</param>
/// <returns>Возвращает декартово произведение заданных множеств.</returns>
public NFuzzySet CartesianProduct(NFuzzySet set, OperationType type = OperationType.MinMax)
{
return(new FuzzyCartesianProduct(this, set, type));
}