Compute scalar speed from velocity

Computes the magnitude of the velocity vector (Euclidean norm) at each time point for each marker/keypoint.

Usage

computeSpeed(pe, velocity_assays = NULL)

Arguments

pe

A PhysioExperiment object containing velocity assays.

velocity_assays

Character vector of velocity assay names. If NULL (default), auto-detects velocity_x/y/z or velocity_kp_x/y.

Value

PhysioExperiment with a new "speed" assay containing the scalar speed: sqrt(vx^2 + vy^2 + vz^2).

References

Winter DA (2009). "Biomechanics and Motor Control of Human Movement." 4th ed. John Wiley & Sons.

See also

computeVelocity() for computing velocity components, computeAcceleration() for computing acceleration.

Examples

if (FALSE) { # \dontrun{
pe <- make_mocap_markers(n_time = 100, n_markers = 4, sr = 120)
pe <- computeVelocity(pe)
pe <- computeSpeed(pe)
} # }