qts2avvts: QTS Transformation to Angular Velocity Vector Time Series

In squat: Statistics for Quaternion Temporal Data

QTS Transformation to Angular Velocity Vector Time Series

Description

This function projects a quaternion time series into the space of angular velocity vectors.

Usage

qts2avvts(x, spar = 0)

Arguments

x	An object of class qts.
spar	smoothing parameter, typically (but not necessarily) in (0,1]. When spar is specified, the coefficient \lambda of the integral of the squared second derivative in the fit (penalized log likelihood) criterion is a monotone function of spar, see the details below. Alternatively lambda may be specified instead of the scale free spar=s.

Value

A time series stored as a tibble::tibble with columns time, x, y and z containing the angular velocity vector at each time point.

Examples

qts2avvts(vespa64$igp[[1]])

squat documentation built on Jan. 16, 2026, 1:07 a.m.