As Joey Tuttle observed yesterday, in J you have the option of switching into extended precision to get exact answers. (Or, if the original numbers are not rational, to get more exact answers.)
A=:2 2 $ 1 1.0000001 1 1 b=:2.0000001 2 b %. A 0.911182 1.08882 b %.&x: A 1 1 ----- Original Message ----- From: John Randall <[email protected]> Date: Monday, January 12, 2009 7:14 Subject: Re: [Jprogramming] Solving formulas To: Programming forum <[email protected]> > Henry Rich wrote: > > 570 470 %. 2 2 $ 3 5 5 3 > > 40 90 > > This is a good method for well conditioned matrices. Results > need to be > interpreted more carefully in cases like > > A=:2 2 $ 1 1.0000001 1 1 > b=:2.0000001 2 > > b %. A > 0.911182 1.08882 > b-:A +/ .* 1 1 > 1 ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
