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Casio fx-991EX vs Hp 50g speed difference
07-18-2018, 04:28 AM (This post was last modified: 07-18-2018 05:50 AM by brickviking.)
Post: #9
RE: Casio fx-991EX vs Hp 50g speed difference
(07-13-2018 08:50 PM)Tugdual Wrote:  Found something weird.
Was speed testing the fx991ex vs 50g on \(\int_0^{500}e^{-x} dx \)
fx-991EX: result:1 time:6.64s
50g using ->NUM : result:1 time:46.69s

Huge difference...

My upgraded 9750GII gave me 1 for that formula: \( \int \)(e^-X,0,500), almost immediately. If I add a tolerance value: \( \int \)(e^-X,0,500,0.01) I get 1.000000014 in about 0.5 seconds
for tolerance values of 0.009 to 0.1724, and 1.000050478 (for a tolerance value of >0.1724 to 0.66558). Larger tolerance values affect the result more. It'd be interesting to see whether the 991EX has this tolerance value in the formula it uses.

(07-13-2018 08:50 PM)Tugdual Wrote:  Pressing EVAL on the 50g returns instantly \( - \frac {1-e^{500}}{e^{500}} \) which seems to indicate that CAS was used since this is the exact result.

My HP50G gave me \(\frac {e^{500}-1}{e^{500}} \) instantly instead of \( - \frac {1-e^{500}}{e^{500}} \) when I hit EVAL from the equation writer. I presume those two are equivalent. I also observed the Approx/Exact discrepancy.

(Post 258)

Regards, BrickViking
HP-50g |Casio fx-9750G+ |Casio fx-9750GII (SH4a)
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RE: Casio fx-991EX vs Hp 50g speed difference - brickviking - 07-18-2018 04:28 AM

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