--- a/inst/@dataframe/permute.m
+++ b/inst/@dataframe/permute.m
@@ -85,7 +85,7 @@
   
   if (2 ~= perm(2)),
     %# recompute the new type
-    dummy = zeros (0, class (sum (cellfun (@(x) zeros (1, class(x(1))),\
+    dummy = zeros (0, class (sum (cellfun (@(x) zeros (1, class(x(1))),...
                                            df._data))));
     resu._type(1:resu._cnt(2)) = class (dummy);
     dummy = permute (df_whole(df), perm);