---
title: "dot(_:_:)"
framework: simd
role: symbol
role_heading: Function
path: "simd/dot(_:_:)-2sdb"
---

# dot(_:_:)

Returns the dot product of two vectors.

## Declaration

```swift
func dot(_ x: SIMD3<Double>, _ y: SIMD3<Double>) -> Double
```

## See Also

### Geometry Functions

- [cross(_:_:)](simd/cross(_:_:)-7sd7t.md)
- [normalize(_:)](simd/normalize(_:)-29n8k.md)
- [project(_:_:)](simd/project(_:_:)-9jlig.md)
- [reflect(_:n:)](simd/reflect(_:n:)-1vw0n.md)
- [refract(_:n:eta:)](simd/refract(_:n:eta:)-13wsy.md)