Documentation for method `atan2`

assembled from the following types:

From Cool

Defined as:

method atan2( = 1e0)

Coerces self and argument to Numeric, using them to compute the two-argument arc-tangent in radians.

say 3.atan2; # OUTPUT: «1.24904577239825»say ⅔.atan2(⅓); # OUTPUT: «1.1071487177940904»

The first argument defaults to 1, so in the first case the function will return the angle θ in radians between a vector that goes from origin to the point (3, 1) and the x axis.