HP Prime Bug bluesun08 Member Posts: 207 Threads: 48 Joined: Feb 2010 10-12-2013, 03:08 PM 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) Gilles Carpentier Senior Member Posts: 468 Threads: 17 Joined: May 2011 10-12-2013, 04:15 PM What do you get? I get the 3 approx results wich seems OK -1.6...., 0, 0.618... CompSystems Member Posts: 213 Threads: 60 Joined: Mar 2013 10-12-2013, 04:29 PM /!\ 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. bluesun08 Member Posts: 207 Threads: 48 Joined: Feb 2010 10-12-2013, 05:27 PM 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. bluesun08 Member Posts: 207 Threads: 48 Joined: Feb 2010 10-13-2013, 09:41 AM Is there anybody who can explain? Tim Wessman Posting Freak Posts: 1,278 Threads: 44 Joined: Jul 2007 10-13-2013, 10:16 AM 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. Edwin Junior Member Posts: 9 Threads: 0 Joined: Sep 2012 10-13-2013, 10:19 AM yes, it is a bug. I made another video: http://youtu.be/I1CtxqS5W4g bluesun08 Member Posts: 207 Threads: 48 Joined: Feb 2010 10-13-2013, 11:21 AM 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. bluesun08 Member Posts: 207 Threads: 48 Joined: Feb 2010 10-13-2013, 11:22 AM What is your firmware version? bluesun08 Member Posts: 207 Threads: 48 Joined: Feb 2010 10-14-2013, 10:46 AM Who is responsible for bugs? Is there an email-address for bugs? Or leaves hp ourselves? CompSystems Member Posts: 213 Threads: 60 Joined: Mar 2013 10-14-2013, 11:34 AM 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 CompSystems Member Posts: 213 Threads: 60 Joined: Mar 2013 10-14-2013, 11:40 AM Who is responsible for bugs? HP-PRIME TEAM Is there an email-address for bugs? Or leaves hp ourselves? required bug reporting page Marcus von Cube, Germany Posting Freak Posts: 3,283 Threads: 104 Joined: Jul 2005 10-14-2013, 12:42 PM +1 here. Reboot. Han Senior Member Posts: 709 Threads: 104 Joined: Nov 2005 10-14-2013, 12:43 PM 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. Han Senior Member Posts: 709 Threads: 104 Joined: Nov 2005 10-14-2013, 12:49 PM 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. bluesun08 Member Posts: 207 Threads: 48 Joined: Feb 2010 10-14-2013, 01:24 PM One reasonable forum would be sufficient. bluesun08 Member Posts: 207 Threads: 48 Joined: Feb 2010 10-14-2013, 01:25 PM Do you know the reason of the mistake? Marcus von Cube, Germany Posting Freak Posts: 3,283 Threads: 104 Joined: Jul 2005 10-14-2013, 03:27 PM No, I've just reproduced the steps and the calculator did a reboot. bluesun08 Member Posts: 207 Threads: 48 Joined: Feb 2010 10-14-2013, 04:32 PM really phat! Han Senior Member Posts: 709 Threads: 104 Joined: Nov 2005 10-14-2013, 10:48 PM 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. « Next Oldest | Next Newest »

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