atan

atan(y[, x])

Parameters

• y (series or numeric) – Value representing the proportion of the y-coordinate.

• x (series or numeric) – Value representing the proportion of the x-coordinate. Default value is 1.

Returns

same type as y

Returns the arc tangent of \(\frac{y}{x}\) in radians in the range \([-\frac{\pi}{2},\frac{\pi}{2}]\)