+- HP Forums (https://www.hpmuseum.org/forum)
+-- Forum: HP Calculators (and very old HP Computers) (/forum-3.html)
+--- Forum: HP Prime (/forum-5.html)
+--- Thread: HP Prime Infinite Sum Bug? (/thread-2392.html)
HP Prime Infinite Sum Bug? - kcnicho - 11-05-2014 07:58 AM
Hi All,
I posted this question over at the HP Calculator site (http://h30499.www3.hp.com/t5/Calculators/HP-Prime-Infinite-Sum-Error/td-p/6662418), thought I'd ask here as well.
HP Prime, in CAS mode, when I enter "sum(1/sqrt(n), n, 1, infinity)", the Prime returns a screen full of warnings (see attachments.)
I believe the correct answer should be "+ infinity", as I get from Wolfram Alpha as well as the TI-Nspire CAS.
Has anyone else seen this? Can anyone else duplicate this behavior on their own machine? I verified this on the Prime Virtual Calculator, Version 2014 3 31, Rev 6031 (latest firmware, as far as I know.)
Thanks,
- Kevin
RE: HP Prime Infinite Sum Bug? - parisse - 11-05-2014 12:34 PM
Sorry, convergence of series is not yet implemented in giac. I plan to do that as part of the new step by step feature.
sum tries to find a closed form for the discrete antiderivative (that's why you see all these messages), it fails, hence returns the sum unevaluated.
RE: HP Prime Infinite Sum Bug? - Adriweb - 11-05-2014 07:17 PM
(11-05-2014 12:34 PM)parisse Wrote: part of the new step by step feature.Oh, that's exciting
(Coming to KhiCAS too ?
)
RE: HP Prime Infinite Sum Bug? - parisse - 11-06-2014 07:05 AM
If I can find a way to display intermediate computations on the nspire screen.
RE: HP Prime Infinite Sum Bug? - kcnicho - 11-06-2014 07:55 AM
Thanks for the (definitive) answer!
Happy to hear that things are in the works to address these types of problems in future firmware releases.
- Kevin
RE: HP Prime Infinite Sum Bug? - salvomic - 01-28-2015 02:03 PM
(11-05-2014 12:34 PM)parisse Wrote: Sorry, convergence of series is not yet implemented in giac. I plan to do that as part of the new step by step feature.
sum tries to find a closed form for the discrete antiderivative (that's why you see all these messages), it fails, hence returns the sum unevaluated.
I hope you could do it soon in a next firmware upgrade, thank you!
It would be very interesting...
Salvo
RE: HP Prime Infinite Sum Bug? - salvomic - 01-28-2015 06:32 PM
...another Series I would se calculated in Prime:
sum((-1)^(k+1)/K^2, k, 1, infinity)
It should give π^2/12
Thank you
Salvo