QTS Transformation to Angular Acceleration Magnitude Time Series — qts2aamts • squat

This function projects a quaternion time series into the space of angular acceleration magnitudes.

Usage

qts2aamts(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 and mag containing the angular acceleration magnitude at each time point.

Examples

qts2aamts(vespa64$igp[[1]])
#> # A tibble: 101 × 2
#>     time magnitude
#>    <int>     <dbl>
#>  1     0  0.00263 
#>  2     1  0.00296 
#>  3     2  0.00129 
#>  4     3  0.00189 
#>  5     4  0.00163 
#>  6     5  0.00168 
#>  7     6  0.00173 
#>  8     7  0.00118 
#>  9     8  0.00102 
#> 10     9  0.000709
#> # ℹ 91 more rows