landmarks_angle {pliman}

Angles between landmarks

Description

Computes the angle from two interlandmark vectors using the difference of their arguments using complex vectors (Claude, 2008).

Usage

landmarks_angle(x, unit = c("rad", "deg"))

Arguments

x

An object computed with landmarks().

unit

The unit of the angle. Defaults to radian (rad). Use unit = "deg" to return the angles in degrees.

Value

A matrix with the angles for each landmark combination.

Note

Borrowed from Claude (2008), pp. 50

References

Claude, J. (2008) Morphometrics with R, Use R! series, Springer 316 pp.

Examples

if(isTRUE(interactive())){
library(pliman)
img <- image_pliman("potato_leaves.jpg")
x <- landmarks(img)
landmarks_angle(x)
}