> 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
