In APL 0 divided by 0 is 1. In J it is 0.
----- Original Message ----- From: Henry Rich <[EMAIL PROTECTED]> Date: Tuesday, April 24, 2007 8:08 am Subject: RE: [Jgeneral] zero > > > 1. Fortran-style complex numbers and failing to distinguish betwee > > +/-0 lead to some numerical problems in physically important > contexts. > I tried to find the paper where he discusses this, and I found > numerous references to it but not the paper itself. Can you > summarize what -0 is needed for? It seems that -0 would have > to produce a different result from +0 to make a difference, > but I can't think of what function would have those different > results. He mentions SQRT, and something about branch cuts, but > I don't get it. > > He says APL set 0/0 = 1. Is that just his blunder? > > Henry Rich ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
