Calculators and numerical differentiation

10312020, 01:20 AM
Post: #3




RE: Calculators and numerical differentiation
(10302020 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/fx880p/ The author suggested Casio is doing central difference formula, based on Casio CFX9×50 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(ah)) / (2h) = 1/(a²h²) < 1/a² Casio fx570MS: d/dx(1/x, 0.001, 0.0001) = 999974.6848 > 1/a² Casio fx115ES+: d/dx(1/x, 0.001) = 999999.999994767 > 1/a² This suggested Casio is not using central difference formula asis. Something more is involved ... 

« Next Oldest  Next Newest »

Messages In This Thread 
Calculators and numerical differentiation  robve  10302020, 09:57 PM
RE: Calculators and numerical differentiation  Paul Dale  10302020, 11:41 PM
RE: Calculators and numerical differentiation  Albert Chan  10312020 01:20 AM
RE: Calculators and numerical differentiation  Wes Loewer  11012020, 05:39 AM
RE: Calculators and numerical differentiation  Albert Chan  11012020, 05:39 PM
RE: Calculators and numerical differentiation  Albert Chan  11012020, 11:43 PM
RE: Calculators and numerical differentiation  Wes Loewer  11032020, 06:09 PM
RE: Calculators and numerical differentiation  Albert Chan  11032020, 10:14 PM
RE: Calculators and numerical differentiation  Wes Loewer  11042020, 04:14 PM
RE: Calculators and numerical differentiation  CMarangon  11032020, 06:55 PM
RE: Calculators and numerical differentiation  Wes Loewer  11042020, 04:04 PM

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