Mike, Many thanks for the guidance. I’d already determined that my x: approaches to #66 were going to involve waiting for the earth to crash into the sun—or, equally unattractive, paying Google Cloud Platform for a fleet of “Godzilla” class VMs—so I am looking in other directions. I took a break and went back to Prime Digit Replacements (#51), the brevity of whose eventual solution filled me with nerd pride :-). (Am I the only Project Euler J developer who gets a guilty thrill from reviewing the magnum opuses submitted by other participants?)
Thanks again. Ed Sent from my iPad > On May 1, 2022, at 8:25 PM, 'Michael Day' via Programming > <programm...@jsoftware.com> wrote: > > Mainly for Ed Gottsman: > > Chat really, but the thread is already here. > > I've just solved Euler Problem 788 with the assistance of extended precision > numbers. The solution is > slow, taking over 14 minutes, but at least it's less than the lifetime of > the universe, unlike my (projected) > methods for some of these problems! > > It's relatively easy, compared with many of the recent questions; > https://projecteuler.net/problem=788 . > > As for Ed's original post, I'll point out that x: features aren't necessary > for the solution of problem 66 > although they can possibly help in understanding it. I don't think that's a > spoiler. > > Cheers, > > Mike > >> On 21/04/2022 17:43, Ed Gottsman wrote: >> Hello. >> I’m working on the Project Euler “Diophantine equation” problem (#66) and >> using J’s extended precision facilities. I’ve run into behavior that >> confuses me. Boiled down (and overusing x: just to be sure): >> x: %: x: 1 + x: *: x: 999999999 >> 999999999 >> That is (if my syntax is right), the square root of (one plus the square of >> a really large n) is n. I’m apparently misunderstanding something about >> extended precision. I’ve tried it with a variety of uses of x: but to no >> avail, and as I read the x: documentation…this is an odd result. >> >> Any help would be much appreciated. >> (J901 on iPadOS, for which sincere kudos to Ian Clark.) >> Many thanks. >> Ed >> ---------------------------------------------------------------------- >> For information about J forums see http://www.jsoftware.com/forums.htm > > > -- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
