Angle between vectors

Usage

angle(x, y, axial, ...)

# S3 method for class 'spherical'
angle(x, y, axial = NULL, ...)

Arguments

x, y: objects of class "Vec3", "Line", "Ray", or "Plane", where the rows are the observations and the columns are the coordinates.
axial: logical. Whether the angle is measured between axial (Line, Plane) or vectorial (Ray, Vec3) data. Axial angles are folded into the range 0–90°, vectorial angles range from 0–180°. For spherical objects, the default (NULL) determines this from the classes of x and y: the angle is axial if either is a Line or Plane.
...: not used.

Value

numeric. Angle in degrees if either x or y is of class Line, Ray, or Plane, otherwise in radians. For a Plane, the angle is measured to its pole.

Examples

angle(Ray(0, 0), Ray(180, 0))
#> [1] 180
angle(Line(0, 0), Line(180, 0))
#> [1] 0

# force vectorial treatment of lines:
angle(Line(0, 0), Line(180, 0), axial = FALSE)
#> [1] 180