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Linear Accelerations

Source: R/dist.R
linear_acc.Rd

Given a set of locations defining a trajectory, this function computes the linear accelerations between each pair of successive locations along the trajectory.

Usage

linear_acc(x, y, t, geo = FALSE)

linAcc(x, y, t, geo = FALSE)

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.

t

A vector of timestamps 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 linear accelerations between each pair of successive locations along the trajectory.

See also

linear_speed, linear_dist

Author

Simon Garnier, garnier@njit.edu

Examples

x <- rnorm(25)
y <- rnorm(25, sd = 3)
t <- as.POSIXct(1:25, origin = Sys.time())
linear_acc(x, y, t)
#>  [1]           NA           NA   2.57227605  -2.51082828  -1.34594545
#>  [6]   3.92583664   3.38706444  10.42133574 -14.51124096   0.03247317
#> [11]   2.57103979  -6.09390115   1.30357381   1.10422518   3.89386637
#> [16]   0.49263023   2.24426366  -3.52656466  -3.63972236   5.11695619
#> [21]  -4.51166445  -2.14925989   1.94022297  -1.59972106   2.31142097