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rmathgeometrycomputational-geometry

Angle between two vectors in R

What the most efficient way in the programming language R to calculate the angle between two vectors?

Solution

  • if you install/upload the library(matlib): there is a function called angle(x, y, degree = TRUE) where x and y are vectors. Note: if you have x and y in matrix form, use as.vector(x) and as.vector(y):

    library(matlib)
matA <- matrix(c(3, 1), nrow = 2)  ##column vectors
matB <- matrix(c(5, 5), nrow = 2)
angle(as.vector(matA), as.vector(matB))  
##default in degrees, use degree = FALSE for radians