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+--- Thread: Reset integrating a function (/thread-2978.html)
Reset integrating a function - salvomic - 01-31-2015 10:42 PM
hi all,
I try:
g(x):=x^2
then
int(g,x) - (also with the graphic tools on C key...)
HP Prime reset and g variable is reset also.
Is it only a problem by me or...?
Any workaround?
Salvo
RE: Reset integrating a function - Offroad - 01-31-2015 11:16 PM
Did the emulator crash?
See attachment.
RE: Reset integrating a function - Tim Wessman - 01-31-2015 11:18 PM
(01-31-2015 10:42 PM)salvomic Wrote: int(g,x) - (also with the graphic tools on C key...)
Try int(g(x),x)
RE: Reset integrating a function - Snorre - 01-31-2015 11:49 PM
Hello Salvo,
I could reproduce the crash for g(x):=x² and int(g,x).
This also happens for int(g) or f(t):=t² and int(f,t), whereas int('sin') or int(f) or h(x):=c and int(h) are mostly fine (somewhat strange results nevertheless).
Since I don't know if a functional form of "int" makes sense anyway (how should it behave for functions with two or more parameters?) -- as opposed to "diff" --, you should use only expressions as arguments (see on-calc help) as Tim suggested.
RE: Reset integrating a function - salvomic - 02-01-2015 09:05 AM
hi all,
here emulator crashes also, but without warning, only message for crash...
int(g(x),x) seems to be ok, as it must be. Yeah Tim, it's correct, I know, but if there is a way to avoid reset it's better: the calculator should only give an error not reset, also if the reset it's not deadly
cheers
RE: Reset integrating a function - parisse - 02-01-2015 09:27 AM
Just checked on emulator, I can not reproduce a crash.
And yes, it would probably be meaningfull to make int(g) work like g'.
RE: Reset integrating a function - Snorre - 02-01-2015 01:06 PM
(02-01-2015 09:27 AM)parisse Wrote: Just checked on emulator, I can not reproduce a crash.Did you name the parameter "x"? Just asking because it matters:
And yes, it would probably be meaningfull to make int(g) work like g'.
g(x):=x and int(g) crashes my device quite reliable.
f(t):=t and int(f) doesn't crash it, but returns (t)->(t*x). So, "int" does not care about the actual parameter as "diff" would do, but always assumes "x" to be the integration variable.
h(x):=c and int(h) doesn't crash, but returns _x->(c*x(_x)) if CAS setting "Exact" is checked, or "Error: Bad Argument Value" if unchecked.
BTW: if CAS setting "Exact" is unchecked I cannot do a simple "restart", so have to either re-check it or do "restart(NULL)".
P.S. Maybe helpful to see what's going on: int(h) says "Warning, evaluating (integrate((x)->c,x))(_x) as a function not as a product".
RE: Reset integrating a function - parisse - 02-01-2015 03:05 PM
Yes, tried with x as variable. But revisions may differ.
RE: Reset integrating a function - salvomic - 02-01-2015 03:11 PM
(02-01-2015 03:05 PM)parisse Wrote: Yes, tried with x as variable. But revisions may differ.
I've firmware 6975, hardware A...
RE: Reset integrating a function - parisse - 02-02-2015 08:51 AM
It probably means that the crash has been fixed since then.
RE: Reset integrating a function - salvomic - 02-02-2015 08:54 AM
(02-02-2015 08:51 AM)parisse Wrote: It probably means that the crash has been fixed since then.
well, 6975 isn't the last public released firmware upgrade?
Is it info about the next release?
Merci!
RE: Reset integrating a function - parisse - 02-02-2015 01:57 PM
All I can say is that it's fixed in Giac/Xcas sourcecode base.
RE: Reset integrating a function - salvomic - 02-02-2015 02:12 PM
(02-02-2015 01:57 PM)parisse Wrote: All I can say is that it's fixed in Giac/Xcas sourcecode base.
ok! ;-)