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Linear Speeds

Source: R/dist.R
linear_speed.Rd

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

Usage

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

linSpeed(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 speeds between each pair of successive locations along the trajectory.

See also

linear_dist, linear_acc

Author

Simon Garnier, garnier@njit.edu

Examples

x <- rnorm(25)
y <- rnorm(25, sd = 3)
t <- as.POSIXct(1:25, origin = Sys.time())
linear_speed(x, y, t)
#>  [1]         NA  4.6482227  1.6677522  1.0535864  4.8443862  3.0080051
#>  [7]  4.5872454  2.0179815  0.8756391  4.1277026  6.5890259  1.5581156
#> [13]  4.3660668  3.0691020  2.3229016  3.5775332  8.3640095  6.5134270
#> [19]  5.6713968  2.9208618  4.5924518  3.5660889  2.0515297  7.3394745
#> [25] 14.3260631