/// <summary>
/// Compute a probability for a node.
/// </summary>
/// <returns>A probability of a node with a value (T/F), considering its parents and their values (T/F)</returns>
public double ComputeProbabilityConsideringParents()
{
// The probability of a node is:
// the probability of that node if has no parents
// the probability conditioned by the parents if it has any
if (0 == ListOfParents.Count)
{
switch (Status)
{
case Status.True:
return(_probabilities[0, 0]);
case Status.False:
return(_probabilities[0, 1]);
}
}
else
{
// The line in matrix is determined by a combination between TRUE/FALSE values of the parents.
// The column is determined by TRUE/FALSE status of current node.
// In case of TRUE, the column is 0, otherwise 1.
// By default, the variable is set to TRUE.
int column = 0;
if (Status == Status.False)
{
column = 1;
}
bool[] correspondingValues = new bool[ListOfParents.Count];
for (int i = 0; i < ListOfParents.Count; ++i)
{
GenericNode parent = ListOfParents.ElementAt(i);
if (parent.Status == Status.False)
{
correspondingValues[i] = false;
}
else if (parent.Status == Status.True)
{
correspondingValues[i] = true;
}
}
for (int i = 0; i < ListOfParents.Count; i++)
{
correspondingValues[i] = correspondingValues[i] ^ true;
}
int val = 0;
for (int i = 0; i < ListOfParents.Count; ++i)
{
val = (val << 1) | ToDigit(correspondingValues[i]);
}
return(_probabilities[val, column]);
}
return(-1);
}
public override int GetHashCode()
{
unchecked
{
var hashCode = (ListOfParents != null ? ListOfParents.GetHashCode() : 0);
hashCode = (hashCode * 397) ^
(TrueProbabilityTextBoxes != null ? TrueProbabilityTextBoxes.GetHashCode() : 0);
hashCode = (hashCode * 397) ^
(FalseProbabilityTextBoxes != null ? FalseProbabilityTextBoxes.GetHashCode() : 0);
hashCode = (hashCode * 397) ^ (_probabilities != null ? _probabilities.GetHashCode() : 0);
hashCode = (hashCode * 397) ^ (Name != null ? Name.GetHashCode() : 0);
hashCode = (hashCode * 397) ^ (int)Status;
return(hashCode);
}
}
