I ran a test for a few million lookups using i. on floating point numbers and found no discrepancy but I created "sl" by a random selection from "fl", so this may not properly replicate your issue.
This was in the new J v. 8.04. On Wed, Jul 1, 2015 at 3:59 PM, <[email protected]> wrote: > Can you give an example, exactly? > > I think this would fail only if some sl is not found in fl. > > Henry Rich > > ---- John Baker <[email protected]> wrote: > > I have observed that this sometimes fails > > > > fl=. 78.9999 ..... some floating list > > sl=. 78.9999 .... some subset of (fl) > > > > (666.666 #~ #sl) (fl i. sl) } fl NB. searching floats > > > > where this always works > > > > (666.666 #~ #sl) ((<.fl) i. <. sl) } <. fl NB. searching integers > > > > When I came across this I thought this could be fixed by comparison > > tolerance. > > > > (666.666 #~ #sl) (fl (i. !.0) sl) } fl > > > > but no luck. > > > > Either this is a bug in J or I am not properly setting comparison > tolerance > > to 0. > > > > > > Floating point - one of life's more intractable necessary evils. > > > > -- > > John D. Baker > > [email protected] > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > -- Devon McCormick, CFA ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
