Casio FX-602P vs fx-4000P, different results
10-28-2021, 09:28 PM
Post: #13
 Nigel (UK) Senior Member Posts: 453 Joined: Dec 2013
RE: Casio FX-602P vs fx-4000P, different results
(10-28-2021 05:32 PM)Dan C Wrote:  Thank you all for your input, i learn new things of calculators (casio) here!
So, i comes down to WHEN the casio do the rounding of digits if i get it right?

But, if so, how can fx-4000P, calculate (sqrt 2)^2 to 2?
I just tried it, and i get the result 2.
Isnt the rounding in play here, or has the calculator a table of the right answers in rom?

If you enter $$(\sqrt{2})^2-1$$ followed by EXE the FX-4000P returns $$-1\times10^{-11}$$, which shows that $$(\sqrt{2})^2$$ is being correctly evaluated as $$1.999\,999\,999\,99$$ to 12 significant figures. However, entering $$(\sqrt{2})^2$$ followed by EXE returns 2 exactly, because of the rounding to 10 significant figures that happens when EXE is pressed.

(Interestingly, the TI-68 calculator allows the user to choose whether pressing ENTER rounds to 10 digits, or whether the full 13-digit precision is retained.)

Nigel (UK)
 « Next Oldest | Next Newest »

 Messages In This Thread Casio FX-602P vs fx-4000P, different results - Dan C - 10-27-2021, 04:23 PM RE: Casio FX-602P vs fx-4000P, different results - Nigel (UK) - 10-27-2021, 07:33 PM RE: Casio FX-602P vs fx-4000P, different results - Dan C - 10-27-2021, 08:21 PM RE: Casio FX-602P vs fx-4000P, different results - Nigel (UK) - 10-27-2021, 08:42 PM RE: Casio FX-602P vs fx-4000P, different results - Csaba Tizedes - 10-28-2021, 07:32 AM RE: Casio FX-602P vs fx-4000P, different results - Paul Dale - 10-28-2021, 08:18 AM RE: Casio FX-602P vs fx-4000P, different results - Maximilian Hohmann - 10-28-2021, 02:55 PM RE: Casio FX-602P vs fx-4000P, different results - Dan C - 10-28-2021, 05:32 PM RE: Casio FX-602P vs fx-4000P, different results - Nigel (UK) - 10-28-2021 09:28 PM RE: Casio FX-602P vs fx-4000P, different results - Steve Simpkin - 10-28-2021, 05:33 PM RE: Casio FX-602P vs fx-4000P, different results - Dan C - 10-28-2021, 05:57 PM RE: Casio FX-602P vs fx-4000P, different results - Maximilian Hohmann - 10-28-2021, 06:16 PM RE: Casio FX-602P vs fx-4000P, different results - rprosperi - 10-28-2021, 07:01 PM RE: Casio FX-602P vs fx-4000P, different results - Dan C - 11-16-2021, 08:00 PM RE: Casio FX-602P vs fx-4000P, different results - johanw - 11-19-2021, 08:48 PM RE: Casio FX-602P vs fx-4000P, different results - Csaba Tizedes - 11-19-2021, 11:46 PM

User(s) browsing this thread: 1 Guest(s)