public virtual ICategoricalDistribution jointDistribution(params IProposition[] propositions)
{
ProbabilityTable d = null;
IProposition conjProp = ProbUtil.constructConjunction(propositions);
ISet <IRandomVariable> vars = CollectionFactory.CreateSet <IRandomVariable>(conjProp.getUnboundScope());
if (vars.Size() > 0)
{
IRandomVariable[] distVars = new IRandomVariable[vars.Size()];
int i = 0;
foreach (IRandomVariable rv in vars)
{
distVars[i] = rv;
++i;
}
ProbabilityTable ud = new ProbabilityTable(distVars);
object[] values = new object[vars.Size()];
CategoricalDistributionIterator di = new CategoricalDistributionIteratorJointDistribution(conjProp, vars, ud, values);
IRandomVariable[] X = conjProp.getScope().ToArray();
bayesInference.Ask(X, new AssignmentProposition[0], bayesNet).iterateOver(di);
d = ud;
}
else
{
// No Unbound Variables, therefore just return
// the singular probability related to the proposition.
d = new ProbabilityTable();
d.setValue(0, prior(propositions));
}
return(d);
}
public NotProposition(IProposition prop)
{
if (null == prop)
{
throw new IllegalArgumentException("Proposition to be negated must be specified.");
}
// Track nested scope
addScope(prop.getScope());
addUnboundScope(prop.getUnboundScope());
proposition = prop;
}
public DisjunctiveProposition(IProposition left, IProposition right)
{
if (null == left)
{
throw new IllegalArgumentException("Left side of disjunction must be specified.");
}
if (null == right)
{
throw new IllegalArgumentException("Right side of disjunction must be specified.");
}
// Track nested scope
addScope(left.getScope());
addScope(right.getScope());
addUnboundScope(left.getUnboundScope());
addUnboundScope(right.getUnboundScope());
this.left = left;
this.right = right;
}
public virtual double prior(params IProposition[] phi)
{
// Calculating the prior, therefore no relevant evidence
// just query over the scope of proposition phi in order
// to get a joint distribution for these
IProposition conjunct = ProbUtil.constructConjunction(phi);
IRandomVariable[] X = conjunct.getScope().ToArray();
ICategoricalDistribution d = bayesInference.Ask(X, new AssignmentProposition[0], bayesNet);
// Then calculate the probability of the propositions phi
// be seeing where they hold.
double[] probSum = new double[1];
CategoricalDistributionIterator di = new CategoricalDistributionIteraorPrior(conjunct, probSum);
d.iterateOver(di);
return(probSum[0]);
}
public ConjunctiveProposition(IProposition left, IProposition right)
{
if (null == left)
{
throw new IllegalArgumentException(
"Left side of conjunction must be specified.");
}
if (null == right)
{
throw new IllegalArgumentException(
"Right side of conjunction must be specified.");
}
// Track nested scope
addScope(left.getScope());
addScope(right.getScope());
addUnboundScope(left.getUnboundScope());
addUnboundScope(right.getUnboundScope());
this.left = left;
this.right = right;
}