Joey K Tuttle wrote: > On my G5 iMac - > > x=: 1000 1000 [EMAIL PROTECTED] 0 NB. random real matrix > 6!:2 'y=: %. x' NB. invert it > 13.7781 > > >./|, (=i.1000) - x +/ .* y NB. how accurate? > 1.97126e_13 >
Random matrices tend to be numerically stable. Unstable ones crop up all the time. hilbert=:]\ %@(i.&.<:@+:) x=:hilbert 10 y=:%.x >./|, (=i.10) - x +/ .* y 0.108042 Best wishes, John ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
