Post Reply 
A digression around VA's SRC #012b
11-28-2022, 02:11 PM
Post: #21
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.
Find all posts by this user
Quote this message in a reply
Post Reply 




User(s) browsing this thread: