Calculators and numerical differentiation
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10-31-2020, 01:20 AM
Post: #3
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RE: Calculators and numerical differentiation
(10-30-2020 09:57 PM)robve Wrote: Came across this article that might be of interest to this forum: "calculators and numerical differentiation" http://blog.damnsoft.org/tag/fx-880p/ The author suggested Casio is doing central difference formula, based on Casio CFX-9×50 manual. On closer reading, it only *illustrated* what is central difference. Using the example f(x)=1/x, a = 0.001, h = 0.0001 f'(a) ≈ (f(a+h) - f(a-h)) / (2h) = -1/(a²-h²) < -1/a² Casio fx-570MS: d/dx(1/x, 0.001, 0.0001) = -999974.6848 > -1/a² Casio fx-115ES+: d/dx(1/x, 0.001) = -999999.999994767 > -1/a² This suggested Casio is not using central difference formula as-is. Something more is involved ... |
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Messages In This Thread |
Calculators and numerical differentiation - robve - 10-30-2020, 09:57 PM
RE: Calculators and numerical differentiation - Paul Dale - 10-30-2020, 11:41 PM
RE: Calculators and numerical differentiation - Albert Chan - 10-31-2020 01:20 AM
RE: Calculators and numerical differentiation - Wes Loewer - 11-01-2020, 05:39 AM
RE: Calculators and numerical differentiation - Albert Chan - 11-01-2020, 05:39 PM
RE: Calculators and numerical differentiation - Albert Chan - 11-01-2020, 11:43 PM
RE: Calculators and numerical differentiation - Wes Loewer - 11-03-2020, 06:09 PM
RE: Calculators and numerical differentiation - Albert Chan - 11-03-2020, 10:14 PM
RE: Calculators and numerical differentiation - Wes Loewer - 11-04-2020, 04:14 PM
RE: Calculators and numerical differentiation - CMarangon - 11-03-2020, 06:55 PM
RE: Calculators and numerical differentiation - Wes Loewer - 11-04-2020, 04:04 PM
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