Use each pair in both directions

Corridor features are the same whichever site is the source, so they are measured once per unordered pair. Models of directional statistics such as dM need a row for each direction; this repeats every row with from and to swapped.

Usage

both_directions(x)

Arguments

x

A data.frame with columns from and to.

Value

x with the reversed pairs appended.

Examples

both_directions(data.frame(from = "a", to = "b", snow = 3))
#>   from to snow
#> 1    a  b    3
#> 2    b  a    3