A stack might be implemented using a data structure like ,&</1e3$123
However, testing seems to indicate that the entire nested structure is copied on every subsequent operation. a=:,&</1e4$123 7!:2'a=:123,&<a' 166144 7!:2'a=:123,&<a' 166144 So, apparently this is a bad idea. -- Raul ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
