take account of the fact that tuples or lists are used to store spares...

take account of the fact that tuples or lists are used to store spares matrices rather than ndarrays of type object

test_mdptoolbox.py

@@ -224,10 +224,10 @@ def test_exampleRand_dense_check():
     assert check(Pr, Rr) == None
 
 def test_exampleRand_sparse_P_shape():
-    assert (Prs.shape == (ACTIONS, ))
+    assert (len(Prs) == ACTIONS)
 
 def test_exampleRand_sparse_R_shape():
-    assert (Rrs.shape == (ACTIONS, ))
+    assert (len(Rrs) == ACTIONS)
 
 def test_exampleRand_sparse_check():
     assert check(Prs, Rrs) == None