init_inflection: Estimate inflection point from a smoothed first derivative

In mnirs: Muscle Near-Infrared Spectroscopy Processing and Analysis

Estimate inflection point from a smoothed first derivative

Description

Shared helper that locates the empirical inflection (peak of ⁠|dx/dt|⁠ after smoothing) and returns the corresponding xmid and slope initial values. Falls back to the half-response point and a mean-rate slope when the derivative is degenerate.

Usage

init_inflection(x, t, A_init, B_init)

Arguments

x	A numeric vector of the response variable (sorted by t).
t	A numeric vector of the predictor variable.
A_init	Estimated starting asymptote.
B_init	Estimated ending asymptote.

Value

A list with elements idx (integer index into x), xmid (numeric t value at the inflection), and slope (numeric dx/dt at the inflection).

mnirs documentation built on Sept. 13, 2026, 1:06 a.m.