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Casio fx-991EX vs Hp 50g speed difference
07-14-2018, 01:45 AM
Post: #4
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...

The function e^-x is not very well-behaved for integration over the interval [0, 500], being close to zero for most of it. Everything happens in a small interval near 0, and that kind of thing makes some numerical integrators converge rather slowly. On my HP-42S, which I'm guessing uses the same Romberg integration algorithm as the RPL numerical integrator, the integral in question takes 2047 evaluations of the function (with ACC=0, which is full accuracy), taking 4 minutes and 4 seconds.
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RE: Casio fx-991EX vs Hp 50g speed difference - Thomas Okken - 07-14-2018 01:45 AM

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