# routine atan2

Documentation for routine `atan2`

assembled from the following types:

# class Cool

From Cool

## (Cool) routine atan2

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.