[Jprogramming] J Scripts

[David Ward Lambert]

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, programming-request at jsoftware.com wrote:
> Date: Thu, 13 Oct 2011 13:52:10 +0100
> From: David Vaughan <purpleblues13 at googlemail.com>
> Subject: [Jprogramming] Remove part of rank-2 array
> To: Programming forum <programming at jsoftware.com>
> Message-ID: <9C5BD390-CAF5-40F2-943C-E0F3AE50BA21 at googlemail.com>
> 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