init_fixed: Wrap a self-start initialiser to support fixed parameters

In mnirs: Muscle Near-Infrared Spectroscopy Processing and Analysis

Wrap a self-start initialiser to support fixed parameters

Description

Decorates a selfStart initial function so parameters supplied as values in the model formula (e.g. SSmonoexponential(t, A = 0, B, tau)) are excluded from the returned start vector. stats::nls() reads the free parameters from the names of that vector, so excluded parameters are treated as constants in the formula. Fixed values are forwarded to the wrapped initialiser as a fixed list argument to seed the remaining free estimates.

Usage

init_fixed(init, params)

Arguments

init	A selfStart initial function ⁠(mCall, data, LHS, ...)⁠.
params	Character vector of the model parameter names.

Value

A function suitable for the initial argument of stats::selfStart().

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