[R] Calculate directions between points

[Wanja Mathar]

Hi everyone,

i have a matrix of points and want to calculate the direction and length of each vector between the points.

I can easily calculate the length with dist(testdata), but is their a function that returns a matrix of the direction of the vectors between points (angles 0-360°)?

testdata <- matrix(1:8, nrow=4, ncol=2,
                dimnames=list(c("A","B","C","D"), c("x","y"))