angle

NAME

angle() - the angle between two vectors, in radians

SYNOPSIS

float angle(int * | float * vector_a, int * | float * vector_b)

DESCRIPTION

Returns the angle between 'vector_a' and 'vector_b', expressed in radians.
It is computed as acos(dotprod(a, b) / (norm(a) * norm(b))). The result is
always a float.

Both vectors must have the same size; otherwise a runtime error is raised
("angle: cannot calculate the angle between vectors of different sizes.").
Each element may independently be an int or a float; an element of any
other type raises a runtime error.

EXAMPLE

angle(({ 1, 0 }), ({ 0, 1 })); // 1.5707963...  (pi/2, a right angle)
angle(({ 1, 0 }), ({ 1, 0 })); // 0.0

SEE ALSO

norm(3), dotprod(3), distance(3)