HP Prime Bug - Printable Version +- HP Forums (https://archived.hpcalc.org/museumforum) +-- Forum: HP Museum Forums (https://archived.hpcalc.org/museumforum/forum-1.html) +--- Forum: Old HP Forum Archives (https://archived.hpcalc.org/museumforum/forum-2.html) +--- Thread: HP Prime Bug (/thread-252756.html) HP Prime Bug - bluesun08 - 10-12-2013 1. Go in CAS-Settings and deactivate "Exact" 2. Then In CAS-View type "solve(x³+x²=x,x)" 3. Look what happen. Whats the matter ? (I have firmware 2013 8 13) Re: HP Prime Bug - Gilles Carpentier - 10-12-2013 What do you get? I get the 3 approx results wich seems OK -1.6...., 0, 0.618... Re: HP Prime Bug - CompSystems - 10-12-2013 /!\ TESTED on HP-PRIME VIRTUAL CALCULATOR (Is Not an Emulator) [CAS MODE & EXACT MODE ON & HP-PRIME "EMULATOR"] solve( x^3+x=x,x); [ENTER] => ```{((-(v¬(5))-1)/2),0,((v¬(5)-1)/2)} // OK ``` [CAS & EXACT MODE OFF] (APPROXIMATE) solve( x^3+x²=x,x); [ENTER] => { -1.61803398875, 0, 0.61803398875} // OK decoding the previous output x=-1.61803398875 OR x=0 OR x= 0.61803398875 x^3+x²=x|x=-1.61803398875; [ENTER] => -1.61803398875 = -1.61803398875 EVAL(Ans); [ENTER] => 1 (TRUE) x^3+x²=x|x=0; [ENTER] => 0 = 0 EVAL(Ans); [ENTER] => 1 (TRUE) but eq0:= x^3+x=x; solve(eq0, x); [ENTER] => returns a different answer every time you press enter [enter] => ... Another BUG with equations solve( x²-10*x+y² = -8 AND x*y²+x-10*y = -8 , { x ,y } ); [ENTER] => { [ 1, 1 ], [ 2.19343941541,3.02046646812 ] } decoding the previous output x = 1 and y = 1 or x = 2.19343941541 and y = 3.02046646812 [CAS MODE & EXACT MODE ON] purge(x,y); x²-10*x+y² = -8 AND x*y²+x-10*y = -8; => 0 ????? BUG x²-10*x+y² = -8 AND x*y²+x-10*y = -8 | x = 1,y = 1; ==> 1 (true) Left part (step to step): x²-10*x+y² = -8|x= 1; => y²-9 = -8 y²-9 = -8|y = 1; => -8 = -8 => true Right part: x*y²+x-10*y = -8 |x= 1; => y²-10*y+1 = -8 y²-10*y+1 = -8|y = 1; => -8 = -8 => true true and true => true but x²-10*x+y² = -8 AND x*y²+x-10*y = -8 | x = 1; => 0 ???? BUG => OK => y²-9 = -8 AND y²-10*y+1 => y²-9 = -8 AND y²-10*y+1 Ans| y=1 => true [CAS & EXACT MODE OFF] (APPROXIMATE) purge(x,y); x²-10*x+y² = -8 AND x*y²+x-10*y = -8; => x²-10*x+y² = -8 AND x*y²+x-10*y = -8; // OK x²-10*x+y² = -8 AND x*y²+x-10*y = -8 | x = 1,y = 1 ==> 1 (true) x:=1; y:=1; x²-10*x+y² = -8 AND x*y²+x-10*y = -8 => 1 (true) Edited: 13 Oct 2013, 5:10 p.m. Re: HP Prime Bug - bluesun08 - 10-12-2013 Look at my video on 0:38. The calculator crash. http://www.youtube.com/watch?v=YE1LiY6wOZo&feature=youtu.be Sorry for the bad quality. Re: HP Prime Bug - bluesun08 - 10-13-2013 Is there anybody who can explain? Re: HP Prime Bug - Tim Wessman - 10-13-2013 I cannot. I have never seen that before. Have you made any changes in the CAS settings screen? If so, please post them. TW Edited: 13 Oct 2013, 10:23 a.m. Re: HP Prime Bug - Edwin - 10-13-2013 yes, it is a bug. I made another video: http://youtu.be/I1CtxqS5W4g Re: HP Prime Bug - bluesun08 - 10-13-2013 Hi Tim, please look also to the video of Edwin. He had the same problem. I make no other changes in the CAS or general settings. I unpacked the calculator, go in CAS mode, change the exact-mode setting an try to solve the equation. Tim, can you reproduce the bug of a real HP Prime with firmware 213 8 13 (5106)? By the way: I have another HP Prime with firmware 2013 7 22. This calculator doesn't reboot but show only the answer {0.} in non-exact mode. Re: HP Prime Bug - bluesun08 - 10-13-2013 What is your firmware version? Re: HP Prime Bug - bluesun08 - 10-14-2013 Who is responsible for bugs? Is there an email-address for bugs? Or leaves hp ourselves? Re: HP Prime Bug - CompSystems - 10-14-2013 Quote: By the way: I have another HP Prime with firmware 2013 7 22. This calculator doesn't reboot but show only the answer {0.} in non-exact mode. press enter again and get a second solution :) eq0:= x^3+x=x; [ENTER] solve(eq0, x); [ENTER] => returns a different answer every time you press enter Re: HP Prime Bug - CompSystems - 10-14-2013 Who is responsible for bugs? HP-PRIME TEAM Is there an email-address for bugs? Or leaves hp ourselves? required bug reporting page Re: HP Prime Bug - Marcus von Cube, Germany - 10-14-2013 +1 here. Reboot. Re: HP Prime Bug - Han - 10-14-2013 Quote: press enter again and get a second solution :) eq0:= x^3+x=x; [ENTER] solve(eq0, x); [ENTER] => returns a different answer every time you press enter The answers are somewhat close to 0. The solutions are on the order of 1E-9 or 1E-18. This behavior is at least consistent with the fact that the CAS is in non-exact mode, but certainly the solver could be more accurate. That said, there is a setting in the CAS for epsilon. So users will likely expect that the solver be at least within epsilon. The default is 1E-12, so values on the order of 1E-9 are not sufficient. Re: HP Prime Bug - Han - 10-14-2013 Quote: Who is responsible for bugs? Is there an email-address for bugs? Or leaves hp ourselves? I am fairly positive that the folks at HP read the forums here, as well as other forums. I know that Tim, Cyrille, and Bernard in particular are active with the community, as well as many of the beta testers. You may be surprised that they frequent this board, adictoshp, cemetech, omnimaga, tiplanet, comp.sys.hp48 and many other forums. Re: HP Prime Bug - bluesun08 - 10-14-2013 One reasonable forum would be sufficient. Re: HP Prime Bug - bluesun08 - 10-14-2013 Do you know the reason of the mistake? Re: HP Prime Bug - Marcus von Cube, Germany - 10-14-2013 No, I've just reproduced the steps and the calculator did a reboot. Re: HP Prime Bug - bluesun08 - 10-14-2013 really phat! Re: HP Prime Bug - Han - 10-14-2013 Quote: One reasonable forum would be sufficient. My point was that users can choose to stick to any one forum they prefer. The folks working on the calculator do check all of them so that regardless of where you post, they will be read. Edited: 14 Oct 2013, 10:48 p.m.