--- layout: stdlib-reference --- # atan2 ## Description Arc tangent of y/x. Returns the angle whose tangent is the quotient of two specified numbers. ## Signature

T atan2<T>(
    T y,
    T x)
    where T : __BuiltinFloatingPointType;

vector<T, N> atan2<T, int N>(
    vector<T, N> y,
    vector<T, N> x)
    where T : __BuiltinFloatingPointType;

matrix<T, N, M> atan2<T, int N, int M>(
    matrix<T, N, M> y,
    matrix<T, N, M> x)
    where T : __BuiltinFloatingPointType;

## Generic Parameters #### T: [\_\_BuiltinFloatingPointType](../interfaces/0_builtinfloatingpointtype-029hm/index.html) #### N : int #### M : int ## Parameters #### y : [T](atan2.html#typeparam-T) The numerator. #### x : [T](atan2.html#typeparam-T) The denominator. #### y : [vector](../types/vector/index.html)\<[T](../types/vector/index.html#typeparam-T), [N](../types/vector/index.html#decl-N)\> The numerator. #### x : [vector](../types/vector/index.html)\<[T](../types/vector/index.html#typeparam-T), [N](../types/vector/index.html#decl-N)\> The denominator. #### y : [matrix](../types/matrix/index.html)\<[T](../types/matrix/t-0.html), [N](../types/matrix/index.html#decl-N), [M](../types/matrix/index.html#decl-M)\> The numerator. #### x : [matrix](../types/matrix/index.html)\<[T](../types/matrix/t-0.html), [N](../types/matrix/index.html#decl-N), [M](../types/matrix/index.html#decl-M)\> The denominator. ## Return value The angle in radians, in the range of [-pi, pi]. ## Availability and Requirements Defined for the following targets: #### hlsl Available in all stages. #### glsl Available in all stages. #### cpp Available in all stages. #### cuda Available in all stages. #### metal Available in all stages. #### wgsl Available in all stages. #### spirv Available in all stages. #### llvm Available in all stages.