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+--- Thread: Reproducible crash with badly defined function (/thread-19092.html)
Reproducible crash with badly defined function - Stefan Falk - 11-07-2022 07:50 PM
Hello everybody,
just for the notes if someone puts this in some bug tracker: The following procedure which I did accidently reproducibly crashes my HP Prime G2 with current firmware:
1) In CAS, with no previous Answer (no 'Ans'), type Ans² and store this as f(x)
2) Compute f(2) or thelike
My Prime either told me that it had a problem and would restart, or it restarts without a message, or the display is complete garbage and the calculator hangs (and can be revived using the Reset hole on its back side).
Happy_crashing ;-)
Stefan
RE: Reproducible crash with badly defined function - Albert Chan - 11-07-2022 09:14 PM
CAS> f := x -> Ans^2 // Ans = f
CAS> f(2) // = f^2 = (x->f^2)^2 = (x->(x->f^2))^2 ..., causing crash
If the goal is to write a thunk to square Ans, we can use indirection, CAS.Ans instead of Ans
CAS> f := NULL -> CAS.Ans^2
CAS> f() // no argument needed, no crash
(program({},{},(double_deux_points(CAS,Ans))^2))^2
(program({},{},(double_deux_points(CAS,Ans))^2))^4
(program({},{},(double_deux_points(CAS,Ans))^2))^8
CAS> 10
CAS> f()
100
10000
100000000
RE: Reproducible crash with badly defined function - Stefan Falk - 11-08-2022 07:44 AM
Hello Albert,
Thanks for your posting. Don't worry, I don't have any problem. I _accidently_ entered that. I wanted to store x² as the function, but forgot to press x before pressing x². That way, Ans² was produced and I just didn't notice. I just wanted to report that that brought the calculator to crash or reboot. Thanks again!
Best Regards,
Stefan
RE: Reproducible crash with badly defined function - jte - 01-07-2023 02:40 AM
(11-07-2022 07:50 PM)Stefan Falk Wrote: Hello everybody,
Hello, Stefan!
Quote:… just for the notes if someone puts this in some bug tracker…
Thanks for posting. I’ve managed to recreate the experience here and have created a ticket for it in “some bug tracker”. :-)
(If anyone reading this would like an account on the bug tracker I’ve set up to help organize matters, just let me know by PM.)
RE: Reproducible crash with badly defined function - Stefan Falk - 01-07-2023 08:34 AM
Hello jte,
Great! Thank you!
Best Regards,
Stefan