| Trig {base} | R Documentation |
These functions give the obvious trigonometric functions. They respectively compute the cosine, sine, tangent, arc-cosine, arc-sine, arc-tangent, and the two-argument arc-tangent.
cos(x) sin(x) tan(x) acos(x) asin(x) atan(x) atan2(y, x)
x, y |
numeric vector |
The arc-tangent of two arguments atan2(y,x) returns the angle
between the x-axis and the vector from the origin to (x,y),
i.e., for positive arguments atan2(y,x) == atan(y/x).
Angles are in radians, not degrees (i.e., a right angle is π/2).
All except atan2 are generic functions: methods can be defined
for them individually or via the Math group generic.
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.