u...@v is defined as u@:v"mv where mv is monadic left rank of v . But, it seems like this is true for non-negative mv only. E.g.: M=. - i. 3 4 NB. any numeric array f0=. <@:|"_1 NB. f0 and f1... f1=. <@(|"_1) NB. ...would be equivalent f0 M NB. u applies to items, ok +-------+-------+---------+ |0 1 2 3|4 5 6 7|8 9 10 11| +-------+-------+---------+ f1 M NB. u applies to whole y, why? +---------+ |0 1 2 3| |4 5 6 7| |8 9 10 11| +---------+
-- WBR Igor ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
