JS should use exactly the same standard as LC https://www.avioconsulting.com/blog/overcoming-javascript-numeric-precision-issues
2^53, same in JS as LC. IEEE 754 Sean On Mon, 22 Mar 2021 at 16:14, John Balgenorth via use-livecode < use-livecode@lists.runrev.com> wrote: > You might be able to get the info by running your javascript > from a shell command. Here is a link that might be of help; > > > https://stackoverflow.com/questions/12659778/is-it-possible-to-run-javascript-files-from-the-command-line > > JB > > > > On Mar 22, 2021, at 9:05 AM, jbv via use-livecode < > use-livecode@lists.runrev.com> wrote: > > > > Hi Craig, > > > > Thank you for the link, but it doesn't help much : > > > > bigDivide(-0.0000007347880794884118999,1000000000) > > returns 0 , -0.000001 > > > > what I'm actually trying to do is to transpose in LC > > an algo for solving cubic equations that runs perfectly > > in javascript. > > So my solution will finally be to multiply data by 10^6, > > run the algo, and then divide the results by 10^6 by > > treating them as strings and moving the dot... > > It's not really elegant and especially quite slow, as I > > need to process large amounts of data and am not sure > > that I'll be able to use LC for that project (which is > > so far only a prototype). > > > > I don't mean to start another endless thread on this topic, > > but one thing puzzles me though : I understand that LC doesn't > > use decimal numbers for internal calculations for reasons > > of speed, but then how come does js perform high precision > > calculations without any speed issues ? > > > > Best > > > > Le 2021-03-22 09:41, Craig Newman via use-livecode a écrit : > >> Check out this thread in the forum: > >> > https://forums.livecode.com/viewtopic.php?f=7&t=25132&p=130985&hilit=longadd#p130985 > >> < > https://forums.livecode.com/viewtopic.php?f=7&t=25132&p=130985&hilit=longadd#p130985 > > > >> Craig > >>>> On Mar 21, 2021, at 7:34 AM, jbv via use-livecode < > use-livecode@lists.runrev.com> wrote: > >>> Paul, Sean, > >>> Thank you both for your answers, although it doesn't really solve my > problem. > >>> The most surprising thing is that javascript runs these calculations > without > >>> problem : > >>> (-0.0000007347880794884118999 / 1000000000) returns > -7.347880794884119e-16 > >>> (-0.0000007347880794884118999 / 1000000000000) returns > -7.347880794884119e-19 > >>> Best > >>> Le 2021-03-21 07:11, Sean Cole (Pi) via use-livecode a écrit : > >>>> Livecode can handle floating point numbers up to 2^52. But then > >>>> calculations would have to fit within that range in a floating point > >>>> perspective too. So, once you add that ninth zero to the end of your > >>>> divider, it struggles with the calculation and returns, effectively, > number > >>>> out of range. > >>>> Fractions in FP binary are tremendously complicated. Calculation in > it are > >>>> even more so. > >>>> https://www.h-schmidt.net/FloatConverter/IEEE754.html > >>>> On Sat, 20 Mar 2021 at 20:23, Paul Dupuis via use-livecode < > >>>> use-livecode@lists.runrev.com> wrote: > >>>>> I don't have an answer, other than to say there has been a LOT of > >>>>> discussion over the years about the limits of number precision in > >>>>> LiveCode and a number of enhancement requests and 3rd party libraries > >>>>> that have attempted to provide a framework for high precision math. > You > >>>>> might search the list archives or search the forum on the LC web site > >>>>> for past discussions about number precision. > >>>>> On 3/20/2021 3:06 PM, jbv via use-livecode wrote: > >>>>> > Hi list, > >>>>> > I am a bit lost : > >>>>> > > >>>>> > set numberformat to ".#########################" > >>>>> > put -0.0000007347880794884118999 / 1000 > >>>>> > -- returns -0.0000000007347880794884119 which is ok > >>>>> > > >>>>> > put -0.0000007347880794884118999 / 1000000 > >>>>> > -- returns -0.0000000000007347880794884 -> also ok > >>>>> > > >>>>> > put -0.0000007347880794884118999 / 100000000 > >>>>> > -- returns -0.0000000000000073478807949 -> still ok > >>>>> > > >>>>> > put -0.0000007347880794884118999 / 1000000000 > >>>>> > -- returns 0 -> ????? > >>>>> > > >>>>> > Any explanations ? > >>>>> > Thanks in advance. > >>>>> > Best, > >>>>> > jbv > >>>>> > > >>>>> > _______________________________________________ > >>>>> > use-livecode mailing list > >>>>> > use-livecode@lists.runrev.com > >>>>> > Please visit this url to subscribe, unsubscribe and manage your > >>>>> > subscription preferences: > >>>>> > http://lists.runrev.com/mailman/listinfo/use-livecode > >>>>> _______________________________________________ > >>>>> use-livecode mailing list > >>>>> use-livecode@lists.runrev.com > >>>>> Please visit this url to subscribe, unsubscribe and manage your > >>>>> subscription preferences: > >>>>> http://lists.runrev.com/mailman/listinfo/use-livecode > >>> _______________________________________________ > >>> use-livecode mailing list > >>> use-livecode@lists.runrev.com > >>> Please visit this url to subscribe, unsubscribe and manage your > subscription preferences: > >>> http://lists.runrev.com/mailman/listinfo/use-livecode > >> _______________________________________________ > >> use-livecode mailing list > >> use-livecode@lists.runrev.com > >> Please visit this url to subscribe, unsubscribe and manage your > >> subscription preferences: > >> http://lists.runrev.com/mailman/listinfo/use-livecode > > > > _______________________________________________ > > use-livecode mailing list > > use-livecode@lists.runrev.com > > Please visit this url to subscribe, unsubscribe and manage your > subscription preferences: > > http://lists.runrev.com/mailman/listinfo/use-livecode > _______________________________________________ > use-livecode mailing list > use-livecode@lists.runrev.com > Please visit this url to subscribe, unsubscribe and manage your > subscription preferences: > http://lists.runrev.com/mailman/listinfo/use-livecode > _______________________________________________ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode
