That makes sense. Thanks,
-- Raul On Sun, Oct 9, 2022 at 7:17 PM 'Michael Day' via General <[email protected]> wrote: > > I don't know about the time for {.a, but this modification helps a bit > > earlier on in the brute force process: > > all=: {{ A#~x=".@>A=. ~. ,arith^:5 ":each y}} > > Putting in a few diagnostics, I found in one run: > > task '' > > terms: 4 7 7 8 9 10 > target: 315 > ┌─────┬──────┬──────┐ > │size │934358│339567│ > └─────┴──────┴──────┘ > #solutions: 428 > for example: ((7+(4+7))*(8+10))-9 > > ... where size reports the dimension of A before and after taking its > nub, ~. > > I'm afraid I didn't time that one, but taking the nub appears to have > saved > > 600 000 odd calculations out of 900 000 odd, as well as 600 000 odd > lines/boxes > > of calculands. > > Cheers, > > Mike > > > On 09/10/2022 18:14, Raul Miller wrote: > > https://rosettacode.org/wiki/Countdown#J > > > > task'' > > terms: 4 7 8 9 10 10 > > target: 300 > > #solutions: 1213 > > for example: (10+(9*10))*((4+7)-8) > > > > The #solutions line takes approaching 20 seconds. That's not the problem > > here. > > > > The 'for example' line takes several seconds in J903 (and J904). And > > the expression is > > echo 'for example: ',;{.a > > > > The only thing I can think of is that this time is occupied by garbage > > collection. > > > > FYI, > > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
