Examples with Assignment org.logicng.datastructures.Assignment used on opensource projects

Example 1 with Assignment

use of org.logicng.datastructures.Assignment in project symja_android_library by axkr.

the class BooleanFunctions method solveInstances.

/**
 * Example: Create a list of rules in the form <code>
 * {{a->False,b->True,c->False,d->False},{a->True,b->False,c->False,d->False},...}</code> for the
 * variables <code>{a,b,c,d}</code>
 *
 * @param booleanExpression an expression build from symbols and boolean operators like <code>
 *     And, Or, Not, Xor, Nand, Nor, Implies, Equivalent,...</code>
 * @param variables the possible variables. Example: <code>{a,b,c,d}</code>
 * @param maximumNumberOfResults
 * @return
 */
public static IAST solveInstances(IExpr booleanExpression, IAST variables, int maximumNumberOfResults) {
    LogicFormula lf = new LogicFormula();
    Variable[] vars = lf.ast2Variable(variables);
    List<Assignment> assignments = logicNGSatisfiabilityInstances(booleanExpression, vars, lf, maximumNumberOfResults);
    Object2IntMap<String> map = LogicFormula.name2Position(vars);
    IASTAppendable list = F.ListAlloc(assignments.size());
    for (int i = 0; i < assignments.size(); i++) {
        if (i >= maximumNumberOfResults) {
            break;
        }
        list.append(lf.literals2VariableList(assignments.get(i).literals(), map));
    }
    EvalAttributes.sort(list, Comparators.REVERSE_CANONICAL_COMPARATOR);
    return list;
}

Example 2 with Assignment

use of org.logicng.datastructures.Assignment in project symja_android_library by axkr.

the class BooleanFunctions method satisfiabilityInstances.

/**
 * Use LogicNG MiniSAT method.
 *
 * <p>
 * Example: Create a list of rules in the form <code>
 * {{False,True,False,False},{True,False,False,False},...}</code> for the variables <code>
 * {a,b,c,d}</code>
 *
 * @param booleanExpression an expression build from symbols and boolean operators like <code>
 *     And, Or, Not, Xor, Nand, Nor, Implies, Equivalent,...</code>
 * @param variables the possible variables. Example: <code>{a,b,c,d}</code>
 * @param maxChoices maximum number of choices, which satisfy the given boolean expression
 * @return
 */
public static IAST satisfiabilityInstances(IExpr booleanExpression, IAST variables, int maxChoices) {
    LogicFormula lf = new LogicFormula();
    Variable[] vars = lf.ast2Variable(variables);
    List<Assignment> assignments = logicNGSatisfiabilityInstances(booleanExpression, vars, lf, maxChoices);
    Object2IntMap<String> map = LogicFormula.name2Position(vars);
    IASTAppendable list = F.ListAlloc(assignments.size());
    for (int i = 0; i < assignments.size(); i++) {
        if (i >= maxChoices) {
            break;
        }
        // 
        list.append(// 
        lf.literals2BooleanList(assignments.get(i).literals(), map));
    }
    EvalAttributes.sort(list, Comparators.REVERSE_CANONICAL_COMPARATOR);
    return list;
}