Bob & Joey’s results are encouraging. I wonder if my problem with 1%2x giving 0 in J902 is something to do with my installation problem for beta-i in Windows which I reported a week or so ago. After the usual pacman update route had resulted in a defective j.dll (I think), I downloaded the zip file and overwrote the j902 install folders.
When I get home tomorrow, some time after noon GMT, with better WiFi and email ability, I’ll try reinstalling unless, in the meantime, anyone else reports the same problem, or advises me not to. Thanks, Mike Sent from my iPad > On 25 Oct 2020, at 21:08, Mike Day <[email protected]> wrote: > > From the iPad again, it comes down to > 1 % 2x > 1r2 NB. In J901, 8, 7 etc > 0 NB. in J902 > So does extended%extended give rational or not? > Mike > > Sent from my iPad > >> On 25 Oct 2020, at 20:58, 'Mike Day' via Beta <[email protected]> wrote: >> >> OK sending with considerable effort from the laptop : >> copy & paste from J902 session in JQt under Windows 10: >> >> JVERSION >> Engine: j902/j64/windows >> Beta-i: commercial/2020-10-20T10:09:05 >> Library: 9.02.06 >> Qt IDE: 1.8.7/5.12.7(5.12.7) >> Platform: Win 64 >> Installer: J902 install >> InstallPath: c:/d/j902 >> Contact: www.jsoftware.com >> %3x (] * <.@^) 2x<.@^>:i.3 >> 0 0 0 >> >> Best wishes >> >> Mike >>> On 25 October 2020 at 20:40 Henry Rich <[email protected]> wrote: >>> >>> >>> I don't get this error. I am running a post-beta-i development system. >>> >>> Henry Rich >>> >>>> On 10/25/2020 4:39 PM, 'Mike Day' via Beta wrote: >>>> I should have mentioned that my example works ok in J901 in Windows as >>>> well as J701 on this tablet. >>>> Mike >>>> >>>> Sent from my iPad >>>> >>>>> On 25 Oct 2020, at 20:27, Mike Day <[email protected]> wrote: >>>>> >>>>> Experimenting with Euler Problem 731, I should get: >>>>> %3(] * <.@^)2<.@^>: i.3. NB. 1/(b^(c^k).c^k) in maths notation >>>>> 0.0555556 0.00308642 1.9052e_5 >>>>> %3x(] * <.@^)2x<.@^>: i.3. NB. Try extended nos >>>>> 1r18 1r324 1r52488 >>>>> >>>>> +/\%3x(] * <.@^)2x<.@^>: i.3. NB. Cum sum >>>>> 1r18 19r324 3079r52488 >>>>> >>>>> 23j20":,.+/\%3x(] * <.@^)2x<.@^>: i.3. Looking for repeated pattern >>>>> .... >>>>> 0.05555555555555555556 >>>>> 0.05864197530864197531 >>>>> 0.05866102728242645938 >>>>> >>>>> Only using k=1,3 here for concise display. >>>>> >>>>> This is the sort of thing I see here on the iPad, and also in J901 >>>>> However, in J902 beta i, I get (can’t email from Windows just now, so >>>>> faking it!): >>>>> >>>>> +/\%3x(] * <.@^)2x<.@^>: i.3. >>>>> 0 0 0 >>>>> >>>>> My mistake!? >>>>> >>>>> Thanks, >>>>> >>>>> Mike >>>>> >>>>> >>>>> Sent from my iPad >>>>> >>>>>> On 25 Oct 2020, at 16:42, Henry Rich <[email protected]> wrote: >>>>>> >>>>>> Modern J uses a virtual block for the result of (, y), so now (+/@, y) >>>>>> and (+/ , y) run at the same speed. A different example is needed. >>>>>> >>>>>> Henry Rich >>>>>> >>>>>>> On 10/25/2020 12:01 PM, Brian Schott wrote: >>>>>>> Jan-Pieter, >>>>>>> >>>>>>> First, thanks for pointing out the link. >>>>>>> But I am having some problems. >>>>>>> >>>>>>> [*******my comment 0) here is likely inappropriate in light of Henry's >>>>>>> reply in this thread >>>>>>> 0) Are you suggesting that some wording be added to that link? It looks >>>>>>> to >>>>>>> me as if you are but where? >>>>>>> I say where because there are at least 3 different concepts treated on >>>>>>> that >>>>>>> page: SC, EIP, and AIP. >>>>>>> ] >>>>>>> >>>>>>> >>>>>>> 1) I am finding problems on that page that I cannot explain. For >>>>>>> example, >>>>>>> a) on one line discussing EIP the following is stated twice, when it is >>>>>>> clear that the two should be different `(V0@[ V1 V2)` . >>>>>>> b) [this comment may also be explained by Henry's reply but I don't see >>>>>>> how] >>>>>>> I cannot confirm the improvements suggested by the example there. >>>>>>> Perhaps using j807 is the problem. See my session below. >>>>>>> 9!:52'' >>>>>>> 1 >>>>>>> a =: 1000 1000 ?@$ 0 NB. it is unfortunate that the +/ >>>>>>> result >>>>>>> suggests that a contains integers, not reals >>>>>>> +/ , a NB. perhaps 1000 1000 >>>>>>> could be reduced to 25 25? >>>>>>> 499960 >>>>>>> +/@, a >>>>>>> 499960 >>>>>>> ts =: 6!:2 , 7!:2@] >>>>>>> ts '+/ , a' NB. notice the small space usage here >>>>>>> 0.001987 1408 >>>>>>> ts '+/@, a' NB. the time reduction is so small as to >>>>>>> be >>>>>>> "within statistical error" >>>>>>> 0.001965 1536 >>>>>>> JVERSION >>>>>>> Engine: j807/j64/darwin >>>>>>> Release-c: commercial/2019-02-24T10:50:40 >>>>>>> Library: 8.07.26 >>>>>>> Platform: Darwin 64 >>>>>>> Installer: J807 install >>>>>>> InstallPath: /users/brian/j64-807 >>>>>>> Contact: www.jsoftware.com >>>>>>> >>>>>>> On Sun, Oct 25, 2020 at 8:42 AM Jan-Pieter Jacobs < >>>>>>> [email protected]> wrote: >>>>>>> >>>>>>>> I guess this is worth mentioning here: >>>>>>>> >>>>>>>> https://code.jsoftware.com/wiki/Vocabulary/SpecialCombinations#Assignments_In_Place_.28AIP.29 >>>>>>>> >>>>>>>> Assignments are done in place if you use a specific form recognised by >>>>>>>> the >>>>>>>> interpreter. >>>>>>>> >>>>>>>> If you do not assign the result, or use it in a longer sentence, it >>>>>>>> will >>>>>>>> not be recognised, copying over the entire array, rather than updating >>>>>>>> a >>>>>>>> single element. >>>>>>>> >>>>>>>> Best regards, >>>>>>>> >>>>>>>> Jan-Pieter >>>>>>>> >>>>>>>> >>>>>>>> -- >>>>>>> (B=) >>>>>>> ---------------------------------------------------------------------- >>>>>>> For information about J forums see http://www.jsoftware.com/forums.htm >>>>>> >>>>>> -- >>>>>> This email has been checked for viruses by AVG. >>>>>> https://www.avg.com >>>>>> >>>>>> ---------------------------------------------------------------------- >>>>>> 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
