[HP Prime] Plots containing complex numbers bug?  Printable Version + HP Forums (https://archived.hpcalc.org/museumforum) + Forum: HP Museum Forums (https://archived.hpcalc.org/museumforum/forum1.html) + Forum: Old HP Forum Archives (https://archived.hpcalc.org/museumforum/forum2.html) + Thread: [HP Prime] Plots containing complex numbers bug? (/thread257606.html) 
[HP Prime] Plots containing complex numbers bug?  Chris Pem10  12042013 Plot the following expression in the Function app:
Edited: 4 Dec 2013, 2:54 p.m. after one or more responses were posted
Re: [HP Prime] Plots containing complex numbers bug?  Mark Hardman  12042013 What if you plot: 3 NTHROOT X *((X+3)/(3 NTHROOT (X+3))) Re: [HP Prime] Plots containing complex numbers bug?  Chris Pem10  12042013 Update... Found yet another way the Prime graphs this function: Re: [HP Prime] Plots containing complex numbers bug?  Chris Pem10  12042013 Not sure how to enter that? Do I use tick marks or something?
Re: [HP Prime] Plots containing complex numbers bug?  Mark Hardman  12042013 I see you learned how to use NTHROOT. The lowerright result is somewhat similar to the Complexvalued plot that you get from Wolfram Alpha except the plot is in the wrong quadrant for 3 < x < 0. Re: [HP Prime] Plots containing complex numbers bug?  Chris Pem10  12042013 I haven't looked into using NTHROOT yet... Edited: 4 Dec 2013, 9:19 p.m.
Re: [HP Prime] Plots containing complex numbers bug?  Tim Wessman  12052013 I'm guessing the 48 series is also deficient since it does exactly the same thing? :) It really gets down to the behavior in the HP math library. NTHROOT (x v/ y) returns the real root, and fractional power will return the principal root instead of the real one. Its probably time to update that I think. No reason not to have the behavior dependent on the complex flag.
TW
Re: [HP Prime] Plots containing complex numbers bug?  cyrille de BrĂ©bisson  12052013 Hello, The main problem is that you are using mathematical functions (^ to a non integer, or NTHROOT) which happends NOT TO BE FUNCTIONS by the strict definition of the word function. ie: these 'function' have multiple mathematicaly correct results and various math system are giving you different (correct) results, which results in a different output plot. Furthemore, depending on the complex setting of Prime, you can get different graphs on the same machine!
cyrille
