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).