Given a set of locations defining a trajectory, this function computes the net squared displacement of the trajectory, that is the squared distances between each location and the first location of the trajectory
Arguments
- x
A vector of x (or longitude) coordinates corresponding to a single trajectory.
- y
A vector of y (or latitude) coordinates corresponding to a single trajectory.
- geo
A logical value indicating whether the locations are defined by geographic coordinates (pairs of longitude/latitude values). Default: FALSE.
Value
A vector of the same length as x and y corresponding to the net squared distances between each location and the first location of the trajectory.
Author
Simon Garnier, garnier@njit.edu
Examples
x <- rnorm(25)
y <- rnorm(25, sd = 3)
nsd(x, y)
#> [1] 0.0000000 18.1102315 36.6186597 11.2771832 11.2396850 6.3807619
#> [7] 0.8442653 14.6692764 12.4115975 10.2423384 8.7656644 11.6464895
#> [13] 2.0427850 4.4151699 15.9143821 22.9723612 53.5573732 4.5401419
#> [19] 17.0471267 3.0030174 0.2266297 27.5857797 13.8485685 8.5402427
#> [25] 10.2851483