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+--- Thread: Prime on a loop inserting a radical (/thread-3004.html)
Pages: 1 2
Prime on a loop inserting a radical - salvomic - 02-04-2015 09:54 PM
I was trying to insert the radical \SQRT((t+i)/(-t+i))^i and Prime is gone on a loop without ending...
Also Emulator behaviors so: top right "clepsydra" (sand clock) working, and after several minutes a dialog box: "The application has crashed and will be restarted"...
With an expression like this first "Simplify" sent the calculator in crash also. The expression was c*t*e^((i/2)*ln((t+i)/(-t+i))), got applying "atrig2ln()" to the expression c*t*e^ATAN(t)... Hit "Simplify" on that expression also emulator (as Prime) hangs...
***
\( \left(\sqrt{ \frac{t+i}{-t+i} }\right) ^{i} \) -> crash
atrig2ln(c*t*e^ATAN(t)) -> -> \( cte^{(\frac{i}{2})\log{ \frac{(-t+i)}{-t+i} }} \) -> Simplify crash also
***
Salvo
RE: Prime on a loop inserting a radical - retoa - 02-06-2015 08:13 AM
I tried this some 20 minutes ago, at first the sandclock worked, then it stopped, the calculator freezed and did not react to any keypresses.
After a long time I had to press the reset key (paper clip) to restart it.
RE: Prime on a loop inserting a radical - salvomic - 02-06-2015 08:21 AM
(02-06-2015 08:13 AM)retoa Wrote: After a long time I had to press the reset key (paper clip) to restart it.
now I don't remember if I pressed, instead, On+Symb, or the Prime restarted by itself...
However is a strange "bug"...
RE: Prime on a loop inserting a radical - retoa - 02-06-2015 08:28 AM
It seems to be related to the imaginary i, I tried
\( \sqrt{((t+a)/(-t+a))^a} \)
and it works.
Then I stored a:=i, retried tha same expression and it freezed again.
RE: Prime on a loop inserting a radical - salvomic - 02-06-2015 08:36 AM
(02-06-2015 08:28 AM)retoa Wrote: ...
Then I stored a:=i, retried tha same expression and it freezed again.
yes!
Emulator (6975) crashes also with only \[ \left(\sqrt{\frac{1}{2}}\right)^{i} \]
help!
RE: Prime on a loop inserting a radical - retoa - 02-06-2015 08:50 AM
(02-06-2015 08:36 AM)salvomic Wrote: ...
Emulator (6975) crashes also with only \[ \left(\sqrt{\frac{1}{2}}\right)^{i} \]
help!
Also my real Prime, it crashes already with
\( \sqrt{2}^i \)
Why ???
RE: Prime on a loop inserting a radical - retoa - 02-06-2015 12:28 PM
xcas does not crash with these expressions, so the problem is only related to HP Prime.
RE: Prime on a loop inserting a radical - salvomic - 05-13-2015 08:21 PM
(02-06-2015 12:28 PM)retoa Wrote: xcas does not crash with these expressions, so the problem is only related to HP Prime.
still the Prime hangs with the firmware 7820...
√2^i and the Prime goes on a loop; hint: On+Symb
Salvo
RE: Prime on a loop inserting a radical - Marcio - 05-13-2015 08:26 PM
Couldn't reproduce any of the errors reported here after the update. Never tried before though.
RE: Prime on a loop inserting a radical - salvomic - 05-13-2015 08:34 PM
(05-13-2015 08:26 PM)Marcio Wrote: Couldn't reproduce any of the errors reported here after the update. Never tried before though.
(√2)^i here in Home ok: 0.9405+0.3396i
In CAS the calculation seems endless, and I can exit only with ON+Symb :-(
RE: Prime on a loop inserting a radical - Marcio - 05-13-2015 08:59 PM
(05-13-2015 08:34 PM)salvomic Wrote:Oh I see. Sorry about that.(05-13-2015 08:26 PM)Marcio Wrote: Couldn't reproduce any of the errors reported here after the update. Never tried before though.
(√2)^i here in Home ok: 0.9405+0.3396i
In CAS the calculation seems endless, and I can exit only with ON+Symb :-(
RE: Prime on a loop inserting a radical - salvomic - 05-13-2015 09:00 PM
(05-13-2015 08:59 PM)Marcio Wrote: Oh I see. Sorry about that.
never mind, no problem by you
RE: Prime on a loop inserting a radical - akmon - 05-17-2015 04:23 PM
Same here, it crashes even with new firmware 7820.
RE: Prime on a loop inserting a radical - Helge Gabert - 05-17-2015 05:31 PM
Yes, same here,
and interestingly, in CAS,
(sqrt(2))^i returns sqrt(2^i).
RE: Prime on a loop inserting a radical - parisse - 05-17-2015 06:09 PM
I just discovered this bug today. Will be fixed for Xcas next week.
RE: Prime on a loop inserting a radical - John Colvin - 05-17-2015 06:46 PM
(05-13-2015 08:34 PM)salvomic Wrote:(05-13-2015 08:26 PM)Marcio Wrote: Couldn't reproduce any of the errors reported here after the update. Never tried before though.
(√2)^i here in Home ok: 0.9405+0.3396
In CAS the calculation seems endless, and I can exit only with ON+Symb :-(
Works fine for me in both Home and CAS: 0.9405... + 0.3397...i. You might check your settings. I have the latest firmware release.
RE: Prime on a loop inserting a radical - Mark Hardman - 05-17-2015 06:59 PM
(05-17-2015 06:46 PM)John Colvin Wrote:(05-13-2015 08:34 PM)salvomic Wrote: (√2)^i here in Home ok: 0.9405+0.3396Works fine for me in both Home and CAS: 0.9405... + 0.3397...i. You might check your settings. I have the latest firmware release.
In CAS the calculation seems endless, and I can exit only with ON+Symb :-(
You're getting approximate results in CAS. Try again with the Exact option checked in the CAS Settings.
RE: Prime on a loop inserting a radical - John Colvin - 05-17-2015 07:14 PM
(05-17-2015 06:59 PM)Mark Hardman Wrote:I assumed it was a settings issue. I tried Exact in Cas and got the symbolic answer(05-17-2015 06:46 PM)John Colvin Wrote: Works fine for me in both Home and CAS: 0.9405... + 0.3397...i. You might check your settings. I have the latest firmware release.
You're getting approximate results in CAS. Try again with the Exact option checked in the CAS Settings.
Sqrt(2^i) but it didn't hang or crash.
RE: Prime on a loop inserting a radical - Mark Hardman - 05-17-2015 08:01 PM
(05-17-2015 07:14 PM)John Colvin Wrote: I assumed it was a settings issue. I tried Exact in Cas and got the symbolic answer
Sqrt(2^i) but it didn't hang or crash.
The bug comes into play when the radical symbol (√) is used:
(05-13-2015 08:34 PM)salvomic Wrote: (√2)^i here in Home ok: 0.9405+0.3396i
In CAS the calculation seems endless, and I can exit only with ON+Symb :-(
It has already been established by Helge that the bug does not present itself if the sqrt() function is used in place of the radical symbol:
(05-17-2015 05:31 PM)Helge Gabert Wrote: Yes, same here,
and interestingly, in CAS,
(sqrt(2))^i returns sqrt(2^i).
Even the developer has agreed that this is a bug.
(05-17-2015 06:09 PM)parisse Wrote: I just discovered this bug today. Will be fixed for Xcas next week.
Sometimes I miss Walter.
.
.
.
Nah...
RE: Prime on a loop inserting a radical - John Colvin - 05-17-2015 08:12 PM
I used the square root key, not the Sqrt() function. I am not denying that there is a bug. I just can't seem to reproduce it. What are your CAS settings?