Since, AFAIK, GCD was originally defined in the context of whole numbers,
you probably get what you deserve using it with non-integers.
On Fri, May 15, 2020 at 7:04 PM Raul Miller <rauldmil...@gmail.com> wrote:
> It is odd, though, that even with comparison tolerance set to zero, +.
> is not associative on fractional floating point values:
>
> 9!:19]0
>
> 0j16":,.+./4.57 4.34 4.44
> 0.0000000000000036
> 0j16":,.+./|.4.57 4.34 4.44
> 0.0000000000290870
>
> It is commutative though:
> (-:|:)+./@>{;~4.57 4.34 4.44
> 1
> 0j16":+./@>{;~4.57 4.34 4.44
> 4.5700000000000003 0.0100000000000655 0.0099999999999758
> 0.0100000000000655 4.3399999999999999 0.0200000000000466
> 0.0099999999999758 0.0200000000000466 4.4400000000000004
>
> I'm not quite sure what's going on here... maybe a built in epsilon
> which is independent of comparison tolerance?
>
> Thanks,
>
> --
> Raul
>
> On Fri, May 15, 2020 at 6:53 PM Hauke Rehr <hauke.r...@uni-jena.de> wrote:
> >
> > In case you are willing to accept labelling it a problem.
> >
> > As I mentioned by altering the thread’s subject, yes,
> > this ain’t a bug. But there may be an opportunity for
> > improvement without sacrifice. Or so do I think.
> >
> >
> > Am 16.05.20 um 00:49 schrieb 'Michael Day' via Programming:
> > > Not a new "bug" - I've still got J503 for some reason - so:
> > >
> > > +./4.57 4.34 4.44
> > > 5.39568e_12
> > >
> > > ABOUTJ_jijs_ NB. nearest thing to JVERSION???
> > > Copyright 1994-2004 Jsoftware Inc.
> > > For information about this and related products:
> > >
> > > Jsoftware Inc.
> > > P.O. Box 330
> > > Excelsior, MN 55331
> > > tel: 952 470-7345 fax: 952 470-9202
> > > www.jsoftware.com
> > > i...@jsoftware.com
> > >
> > > As Devon and Henry suggest, it's the usual problem with "exact"
> > > representation of reals.
> > >
> > > Mike
> > >
> > >
> > >
> > > On 15/05/2020 15:17, 'Bo Jacoby' via Programming wrote:
> > >> +./4.57 4.34 4.44
> > >> 5.39568e_12
> > >>
> > >> NB. this was not the correct answer. A bug?
> > >>
> > >> +./x:4.57 4.34 4.44
> > >>
> > >> 1r100
> > >>
> > >> NB. this was a work-around
> > >> Thanks!
> > >> Bo.
> > >>
> > >>
> > >>
> > >>
> > >> ----------------------------------------------------------------------
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> > >
> >
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--
Devon McCormick, CFA
Quantitative Consultant
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