http://www.jsoftware.com/docs/help701/phrases/special_matrices.htm
Starting at m24 are several definitions for lower triangular matrix in the book of j phrases. Generate a matrix of the same size and multiply atoms. A * LT Scripts: j will "certainly" have stored some on your system. Look for them with your operating system and favorite program editor. Where are these scripts? If you're using j version 6 USERFOLDERS_j_ SYSTEMFOLDERS_j_ and under j7 these sentences will aid your script search: UserFolders_j_ SystemFolders_j_ On either system this sentence should help you locate your j scripts. jpath '~user' Thu, 2011-10-13 at 20:58 +0800, [email protected] wrote: > Date: Thu, 13 Oct 2011 13:52:10 +0100 > From: David Vaughan <[email protected]> > Subject: [Jprogramming] Remove part of rank-2 array > To: Programming forum <[email protected]> > Message-ID: <[email protected]> > Content-Type: text/plain; charset=us-ascii > > I have an array like: > > 2 3 4 > 3 4 5 > 4 5 6 > > but I want to delete the upper right corner like so: > > 2 0 0 > 3 4 0 > 4 5 6 ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
