atan2() [7/11]

var stan::math::atan2 ( const var &  a, double  b  )

inline

Return the principal value of the arc tangent, in radians, of the first variable divided by the second scalar (cmath).

The derivative with respect to the variable is

$\frac{d}{d x} \arctan \frac{x}{c} = \frac{c}{x^2 + c^2}$.

Parameters

a	Numerator variable.
b	Denominator scalar.

Returns

The arc tangent of the fraction, in radians.

Definition at line 49 of file atan2.hpp.