initial_params: Create initial parameters for (inverse) warping functions

In registr: Curve Registration for Exponential Family Functional Data

Create initial parameters for (inverse) warping functions

Description

Dependent on the specific type of warping functions, this function creates a vector of initial parameters. For "nonparametric" warpings that are based on a given spline basis matrix, the initial parameters are defined s.t. the resulting (inverse) warping function equals a diagonal line. For "piecewise_linear2" warpings a fixed parameter vector is returned.

Usage

initial_params(warping = "nonparametric", K, t_vec)

Arguments

warping	If nonparametric (default), inverse warping functions are estimated nonparametrically. If piecewise_linear2 they follow a piecewise linear function with 2 knots.
K	Spline basis matrix defined over the interval c(t_min, t_max).
t_vec	Vector of the observed and potentially irregular time grid.

registr documentation built on Oct. 3, 2022, 1:05 a.m.