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Code Issues 12 Releases 8 Activity

Fixed handling of goal in example encoding. 

The example encoding assumed that derived predicates weren’t necessary
in the final time step. This is, however, incorrect, as the goal may
have a precondition that requires derived predicates. In this case, the
derived variables must be evaluated for the final time step.
This commit is contained in:
Patrick Lühne 2017-11-17 17:32:05 +01:00
parent f7e089042d
commit b2280c155a
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1 changed files with 3 additions and 3 deletions
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6
encodings/sequential-horizon.lp
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@ -17,14 +17,14 @@ holds(Variable, Value, 0) :- initialState(Variable, Value).
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% conjunctive preconditions
satisfied(DerivedPredicate, type(and), T) :- derivedPredicate(DerivedPredicate, type(and)), holds(Variable, Value, T) : precondition(DerivedPredicate, type(and), Variable, Value); time(T + 1).
satisfied(DerivedPredicate, type(and), T) :- derivedPredicate(DerivedPredicate, type(and)), holds(Variable, Value, T) : precondition(DerivedPredicate, type(and), Variable, Value); time(T).
% disjunctive preconditions
satisfied(DerivedPredicate, type(or), T) :- precondition(DerivedPredicate, type(or), Variable, Value), holds(Variable, Value, T), time(T + 1).
satisfied(DerivedPredicate, type(or), T) :- precondition(DerivedPredicate, type(or), Variable, Value), holds(Variable, Value, T), time(T).
holds(DerivedVariable, Value, T) :- satisfied(DerivedPredicate, Type, T), postcondition(DerivedPredicate, Type, effect(unconditional), DerivedVariable, Value).
holds(derivedVariable(DerivedVariable), value(DerivedVariable, false), T) :- derivedVariable(DerivedVariable), not holds(derivedVariable(DerivedVariable), value(DerivedVariable, true), T), time(T + 1).
holds(derivedVariable(DerivedVariable), value(DerivedVariable, false), T) :- derivedVariable(DerivedVariable), not holds(derivedVariable(DerivedVariable), value(DerivedVariable, true), T), time(T).
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% Perform actions