---
title: "atan2(_:_:)"
framework: simd
role: symbol
role_heading: Function
path: "simd/atan2(_:_:)-19fnn"
---

# atan2(_:_:)

Returns the arctangent of each pair of corresponding elements in two vectors.

## Declaration

```swift
func atan2(_ y: simd_double4, _ x: simd_double4) -> simd_double4
```

## See Also

### Trigonometric Functions

- [acos(_:)](simd/acos(_:)-9cb48.md)
- [asin(_:)](simd/asin(_:)-70soc.md)
- [atan(_:)](simd/atan(_:)-5w6c7.md)
- [cos(_:)](simd/cos(_:)-1leci.md)
- [cospi(_:)](simd/cospi(_:)-8cke2.md)
- [sin(_:)](simd/sin(_:)-67ulu.md)
- [sinpi(_:)](simd/sinpi(_:)-45nf0.md)
- [sincos(_:)](simd/sincos(_:)-9olep.md)
- [sincospi(_:)](simd/sincospi(_:)-40ymv.md)
- [tan(_:)](simd/tan(_:)-5zsp2.md)
- [tanpi(_:)](simd/tanpi(_:)-54qo6.md)