This looks like a bug. It was noticed by my brother-in-law.
NB. If we start by erasing variables, erase 'aa bb' 1 1 NB. then the following two results NB. cannot both be correct: (4!:0 :: 9: ) < 'aa__bb' _1 4!:0 < 'aa__bb' |value error: bb | 4!:0<'aa__bb' ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
