append_displacement: Return a dataframe with information about the time-to-time displacements
Description
The displacement is a bit more complicated than other dynamical variables,
as it depends on the sampling frequency. If you are subsampling, always re-run
append_displacement after subsampling.
Usage
append_displacement(data)
Arguments
data
A dataframe containing t, x and y
Value
A data frame including all the dynamical information, including displacements