Ambrus wrote: > Try using #&.|. to get the fills before the element.
Yep, I'm aware of #.&|. and I use it. But it's longer and slower. Right now a j. -b is a domain error and it would be an elegant, consistent extension of the notation (so much so that it's almost surprising it doesn't exist yet), and the interpreter could implement it much more efficiently than #&.|. (unless Roger wants to support that construct with special code). See also http://www.jsoftware.com/pipermail/programming/2010-March/018858.html -Dan ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
