--- layout: stdlib-reference --- # copysign ## Description Copy-sign. Returns a value whose magnitude is from one operand and whose sign is from another operand. ## Signature

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

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

## Generic Parameters #### T: [\_\_BuiltinFloatingPointType](../interfaces/0_builtinfloatingpointtype-029hm/index.html) #### N : int ## Parameters #### x : [vector](../types/vector/index.html)\<[T](../types/vector/index.html#typeparam-T), [N](../types/vector/index.html#decl-N)\> The value to use as the magnitude. #### y : [vector](../types/vector/index.html)\<[T](../types/vector/index.html#typeparam-T), [N](../types/vector/index.html#decl-N)\> The value to use as the sign. #### x : [T](copysign.html#typeparam-T) The value to use as the magnitude. #### y : [T](copysign.html#typeparam-T) The value to use as the sign. ## Return value A value whose magnitude is from x and whose sign is from y. ## 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. #### spirv Available in all stages.