A digression around VA's SRC #012b
11-28-2022, 02:11 PM
Post: #21
 Albert Chan Senior Member Posts: 2,682 Joined: Jul 2018
RE: A digression around VA's SRC #012b
(11-27-2022 03:45 PM)Albert Chan Wrote:  FNROOT is interpolating the secant line for root, from points (x1,y1), (x2,y2)

My mistake. From HP Journal, July 1984

Quote:The search for a root proceeds by bent-secant, quadratic interpolation, and minima-bounding methods, depending on the detected shape of the function.

FNROOT always return something. Confirmation of root, FVALUE ≈ 0, is required.

Quote:FNBOOT will return a value when it finds a root, a local minimum of absolute value, or a pair of neighboring machine-representable numbers across which the function changes sign, when the search leads out of the range of representable numbers, or when quadratic interpolation has been used eight times in succession.
 « Next Oldest | Next Newest »

 Messages In This Thread A digression around VA's SRC #012b - J-F Garnier - 11-25-2022, 02:00 PM RE: A digression around VA's SRC #012b - Werner - 11-25-2022, 02:21 PM RE: A digression around VA's SRC #012b - J-F Garnier - 11-25-2022, 04:20 PM RE: A digression around VA's SRC #012b - EdS2 - 11-25-2022, 05:22 PM RE: A digression around VA's SRC #012b - Albert Chan - 11-25-2022, 11:14 PM RE: A digression around VA's SRC #012b - rprosperi - 11-26-2022, 03:18 AM RE: A digression around VA's SRC #012b - J-F Garnier - 11-26-2022, 10:20 AM RE: A digression around VA's SRC #012b - rprosperi - 11-26-2022, 01:18 PM RE: A digression around VA's SRC #012b - J-F Garnier - 11-26-2022, 02:22 PM RE: A digression around VA's SRC #012b - C.Ret - 11-26-2022, 02:18 PM RE: A digression around VA's SRC #012b - Albert Chan - 11-26-2022, 11:24 AM RE: A digression around VA's SRC #012b - J-F Garnier - 11-26-2022, 11:29 AM RE: A digression around VA's SRC #012b - Albert Chan - 11-26-2022, 08:06 PM RE: A digression around VA's SRC #012b - Albert Chan - 11-26-2022, 04:45 PM RE: A digression around VA's SRC #012b - C.Ret - 11-27-2022, 02:36 AM RE: A digression around VA's SRC #012b - J-F Garnier - 11-27-2022, 09:30 AM RE: A digression around VA's SRC #012b - C.Ret - 11-27-2022, 10:36 AM RE: A digression around VA's SRC #012b - rprosperi - 11-27-2022, 03:22 PM RE: A digression around VA's SRC #012b - Albert Chan - 11-27-2022, 12:14 PM RE: A digression around VA's SRC #012b - Albert Chan - 11-27-2022, 03:45 PM RE: A digression around VA's SRC #012b - Albert Chan - 11-28-2022 02:11 PM