If that's the case, how does this happen? 3!:0 x:_ 128
-- Raul On Wed, Feb 3, 2016 at 4:04 PM, Thomas Costigliola <[email protected]> wrote: > Infinity is a feature of double; extended integers and rationals have no > notion of infinity so normally arithmetic gets done in double. So if your > array has numbers that are too large for machine integers the easy way out > is to convert the extended precision. You could test for special cases, > e.g., when <. has an extended and double argument that only contains > infinity and return the extended, but that doesn't seem very satisfying. I > think it requires more thought. > > BTW, anyone is welcome to discuss extensions to Unbox by opening a new > issue: https://github.com/iocane/unbox/issues > > If you are not satisfied with that system I am open to suggestions for > implementing a better one. > > > On 02/03/2016 02:02 PM, Dan Bron wrote: >> >> I know we have yet to organize a formal process for building and >> disseminating a community-driven implementation of J, but in anticipation of >> that day’s arrival, perhaps we can start collecting community-driven >> proposals for enhancements? >> >> One such enhancement could be special code that detects whether the >> argument to an arithmetic dyad is the scalar _ (or __ or _.) and if so, >> avoids demoting the other argument to double if it’s already extended or >> rational. >> >> I have other ideas too. But maybe we should collect them on the Wiki? >> >> -Dan >> >> >>> On Feb 2, 2016, at 9:12 PM, Henry Rich <[email protected]> wrote: >>> >>> No, extendeds promote to float on mixed operations. >>> >>> Henry Rich >>> >>> On 2/2/2016 9:09 PM, 'Pascal Jasmin' via Programming wrote: >>>> >>>> 9223372036854736345 <. _ >>>> 9.22337e18 >>>> >>>> result is a double. <. double is the closest integer it can find. >>>> >>>> this seems like a problem though: >>>> >>>> >>>> 9223372036854736345x <. _ >>>> 9.22337e18 >>>> >>>> >>>> >>>> ----- Original Message ----- >>>> From: Henry Rich <[email protected]> >>>> To: Programming forum <[email protected]> >>>> Sent: Tuesday, February 2, 2016 9:05 PM >>>> Subject: [Jprogramming] When a <. _ is less than a >>>> >>>> I'm stepping up to the world of 64-bit integers, and stepping into >>>> cowflops. >>>> >>>> This took me quite a while: >>>> >>>> <. 9223372036854736345 <. _ >>>> >>>> 9223372036854735872 >>>> >>>> >>>> See that? Take the minimum of (number) and (infinity), and the result >>>> is less than (number)! >>>> >>>> Yes, I understand why it happens. Now I do. Be warned. >>>> >>>> Henry Rich >>>> ---------------------------------------------------------------------- >>>> For information about J forums see http://www.jsoftware.com/forums.htm >>>> ---------------------------------------------------------------------- >>>> For information about J forums see http://www.jsoftware.com/forums.htm >>> >>> ---------------------------------------------------------------------- >>> For information about J forums see http://www.jsoftware.com/forums.htm >> >> ---------------------------------------------------------------------- >> For information about J forums see http://www.jsoftware.com/forums.htm > > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
