/** Copies the info out of the old proposition into a new proposition for the new BayesIm. */
public Proposition(VariableSource variableSource, Proposition proposition) {
this(variableSource);
if (proposition == null) {
throw new NullPointerException();
}
List<Node> variables = variableSource.getVariables();
List<Node> oldVariables = proposition.getVariableSource().getVariables();
for (int i = 0; i < variables.size(); i++) {
DiscreteVariable variable = (DiscreteVariable) variables.get(i);
int oldIndex = -1;
for (int j = 0; j < oldVariables.size(); j++) {
DiscreteVariable _variable = (DiscreteVariable) oldVariables.get(j);
if (variable.equals(_variable)) {
oldIndex = j;
break;
}
}
if (oldIndex != -1) {
for (int j = 0; j < allowedCategories[i].length; j++) {
allowedCategories[i][j] = proposition.isAllowed(oldIndex, j);
}
}
}
}
/**
* @return the estimated conditional probability for the given assertion conditional on the given
* condition.
*/
public double getConditionalProb(Proposition assertion, Proposition condition) {
if (assertion.getVariableSource() != condition.getVariableSource()) {
throw new IllegalArgumentException(
"Assertion and condition must be " + "for the same Bayes IM.");
}
List<Node> assertionVars = assertion.getVariableSource().getVariables();
List<Node> dataVars = dataSet.getVariables();
assertionVars = GraphUtils.replaceNodes(assertionVars, dataVars);
if (!new HashSet<Node>(assertionVars).equals(new HashSet<Node>(dataVars))) {
throw new IllegalArgumentException(
"Assertion variable and data variables"
+ " are either different or in a different order: "
+ "\n\tAssertion vars: "
+ assertionVars
+ "\n\tData vars: "
+ dataVars);
}
int[] point = new int[dims.length];
int count1 = 0;
int count2 = 0;
this.missingValueCaseFound = false;
point:
for (int i = 0; i < numRows; i++) {
for (int j = 0; j < dims.length; j++) {
point[j] = dataSet.getInt(i, j);
if (point[j] == DiscreteVariable.MISSING_VALUE) {
continue point;
}
}
if (condition.isPermissibleCombination(point)) {
count1++;
if (assertion.isPermissibleCombination(point)) {
count2++;
}
}
}
return count2 / (double) count1;
}
/**
* Restricts this proposition to the categories for the given variable that are true in the given
* proposition.
*/
public void restrictToProposition(Proposition proposition, int variable) {
if (proposition.getVariableSource() != this.variableSource) {
throw new IllegalArgumentException(
"Can only restrict to " + "propositions for the same variable source.");
}
for (int j = 0; j < allowedCategories[variable].length; j++) {
if (!proposition.isAllowed(variable, j)) {
removeCategory(variable, j);
}
}
}
/**
* Restricts this proposition to the categories for each variable that are true in the given
* proposition.
*/
public void restrictToProposition(Proposition proposition) {
if (proposition.getVariableSource() != this.variableSource) {
throw new IllegalArgumentException(
"Can only restrict to " + "propositions for the same variable source.");
}
for (int i = 0; i < allowedCategories.length; i++) {
for (int j = 0; j < allowedCategories[i].length; j++) {
if (!proposition.allowedCategories[i][j]) {
this.allowedCategories[i][j] = false;
}
}
}
}
