Really interesting. So, I thought that maybe inv could be redefined as (;:^._1). But all I get is:
inv_z_=.(;:^._1) |domain error | inv_z_=.( ;:^._1) t=:*(;:^._1) |domain error | t=:*( ;:^._1) (;:^._1) |domain error | ( ;:^._1) ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
