Calculate tortuosity metrics over sliding windows

Renamed to add_tortuosity(), which takes the same arguments. This returns exactly what it did: columns straightness, sinuosity and emax, plus every kinematic column of calculate_kinematics() when the frame did not already have velocities and speed. add_tortuosity() adds only its three measures, with the window width in their names (straightness_11, sinuosity_11, e_max_11).

Usage

calculate_tortuosity(data, window_width = 11L)

Arguments

data

A Cartesian anipoint.

window_width

Size of the sliding window, in observations (default 11L). Should be an odd number >= 3 for symmetric centering.

Value

The input anipoint with straightness, sinuosity and emax added, and the kinematic columns if they were missing.