fix: set all scores to null initially (#4)

src/main/java/org/matsim/run/replaceCarByDRT/ReplaceCarByDRT.java

@@ -34,7 +34,6 @@
 import org.matsim.api.core.v01.network.Network;
 import org.matsim.api.core.v01.population.*;
 import org.matsim.contrib.common.util.StraightLineKnnFinder;
-import org.matsim.core.gbl.MatsimRandom;
 import org.matsim.core.network.algorithms.MultimodalNetworkCleaner;
 import org.matsim.core.population.PopulationUtils;
 import org.matsim.core.population.routes.NetworkRoute;
@@ -139,7 +138,7 @@ static void prepareInputPlansForCarProhibitionWithPRLogic(Scenario scenario,
 		PopulationFactory fac = scenario.getPopulation().getFactory();
 		MutableInt replacedTrips = new MutableInt();
 
-		Random rnd = MatsimRandom.getRandom();
+		Random rnd = new Random(4711);
 
 		StraightLineKnnFinder<Activity,PRStation> straightLineKnnFinder = new StraightLineKnnFinder<>(kPrStations, Activity::getCoord, PRStation::getCoord);
 		log.warn("will assume that the first activity of each person is the home activity. This holds true for the open Berlin scenario. For other scenarios, please check !!");
@@ -162,6 +161,9 @@ static void prepareInputPlansForCarProhibitionWithPRLogic(Scenario scenario,
 
 			for (Plan plan : person.getPlans()) {
 
+				//we (sometimes) make plan copies. remove all scores values, thus ensure that all plans are executed at least once.
+				plan.setScore(null);
+
 				//will in fact put an attribute into the origin activity
 				List<TripStructureUtils.Trip> tripsToReplace = collectAndAttributeTripsToReplace(scenario, plan, mainModeIdentifier, Set.of(TransportMode.car, TransportMode.ride), carFreeGeoms);
 				if (tripsToReplace.isEmpty()){
@@ -329,9 +331,10 @@ static void prepareInputPlansForCarProhibitionWithPRLogic(Scenario scenario,
 			}
 			//after we've iterated over existing plans, add all the plan copies
 			plansToAdd.forEach(plan -> person.addPlan(plan));
-		}
-		//TODO iterate over all plans, set score to null !!
 
+			//select random plan
+			person.setSelectedPlan(person.getPlans().get(rnd.nextInt(person.getPlans().size())));
+		}
 
 		log.info("overall nr of trips replaced = " + replacedTrips);
 		log.info("finished modifying input plans....");