bugfix in get_identifiers

system/dataset.py

@@ -161,7 +161,7 @@ class Dataset:
             ids = self._map[dim].keys()
 
         if indices != None:
-            ids = [self._map[index] for index in indices]
+            ids = [ids[index] for index in indices]
 
         return ids
         
@@ -177,7 +177,7 @@ class Dataset:
         if idents==None:
             index = array_sort(self._map[dim].values())
         else:
-            index = [self.map[dim][key] for key in idents]
+            index = [self._map[dim][key] for key in idents]
         return asarray(index)
      
 class CategoryDataset(Dataset):