Mulling it over on the train, I realize my speculation is far fetched and may not even make sense.
Also, I now remember seeing a 'non-unique sparse elements' error result from a bug in dyad I. , so maybe it just happens when J gets confused. In any case, I hope my report enabled you to reproduce the error. -Dan ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
