1 files changed, 4 insertions, 2 deletions
diff --git a/src/de/lmu/ifi/dbs/elki/algorithm/statistics/AveragePrecisionAtK.java b/src/de/lmu/ifi/dbs/elki/algorithm/statistics/AveragePrecisionAtK.java
index 1c74621b..f6f1d16f 100644
--- a/src/de/lmu/ifi/dbs/elki/algorithm/statistics/AveragePrecisionAtK.java
+++ b/src/de/lmu/ifi/dbs/elki/algorithm/statistics/AveragePrecisionAtK.java
@@ -34,6 +34,7 @@ import de.lmu.ifi.dbs.elki.data.type.TypeInformation;
 import de.lmu.ifi.dbs.elki.data.type.TypeUtil;
 import de.lmu.ifi.dbs.elki.database.Database;
 import de.lmu.ifi.dbs.elki.database.ids.DBID;
+import de.lmu.ifi.dbs.elki.database.ids.DBIDIter;
 import de.lmu.ifi.dbs.elki.database.ids.DBIDUtil;
 import de.lmu.ifi.dbs.elki.database.ids.DBIDs;
 import de.lmu.ifi.dbs.elki.database.query.DistanceResultPair;
@@ -101,7 +102,7 @@ public class AveragePrecisionAtK<V extends Object, D extends NumberDistance<D, ?
   }
 
   @Override
-  public HistogramResult<DoubleVector> run(Database database) throws IllegalStateException {
+  public HistogramResult<DoubleVector> run(Database database) {
     final Relation<V> relation = database.getRelation(getInputTypeRestriction()[0]);
     final Relation<Object> lrelation = database.getRelation(getInputTypeRestriction()[1]);
     final DistanceQuery<V, D> distQuery = database.getDistanceQuery(relation, getDistanceFunction());
@@ -122,7 +123,8 @@ public class AveragePrecisionAtK<V extends Object, D extends NumberDistance<D, ?
     }
     FiniteProgress objloop = logger.isVerbose() ? new FiniteProgress("Computing nearest neighbors", ids.size(), logger) : null;
     // sort neighbors
-    for(DBID id : ids) {
+    for(DBIDIter iter = ids.iter(); iter.valid(); iter.advance()) {
+      DBID id = iter.getDBID();
       KNNResult<D> knn = knnQuery.getKNNForDBID(id, k);
       Object label = lrelation.get(id);