RPL exercise - Last Digits of Primes (HP 49G, G+, 50g)
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06-02-2019, 09:18 PM
(This post was last modified: 06-02-2019 10:12 PM by Gilles.)
Post: #20
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RE: RPL exercise - Last Digits of Primes (HP 49G, G+, 50g)
Here a newRPL version :
Code:
10'000 -> { 2485 2515 2508 2492 } in 0.01s 100'000 -> { 24968 25008 25015 25009 } in 0.78s 1'000'000 -> { 249934 250109 250017 249940 } in 23.2 s 10'000'000 -> { 2499756 2500208 2500284 2499752 } in 963s I notice that in newRPL : - LIST is little faster than ARRAY - Local variable is faster than big juggles with the stack - MAP is little faster than DOSUBS (MAP is very slow in UserRPL) - There is a problem with this program on my HP50g hdw (reported to Claudio) - Albert Chan suggest in a post to optimise by counting only 1,3,7's, and derive the count of 9's, but this need a test and there is no significant gain. ( I probably do a typo error in my previous post for the output , I will verify) |
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