---
title: "normalize(_:)"
framework: simd
role: symbol
role_heading: Function
path: "simd/normalize(_:)-3lhrd"
---

# normalize(_:)

Returns a vector pointing in the same direction of the supplied vector with a length of 1.

## Declaration

```swift
func normalize(_ x: SIMD4<Double>) -> SIMD4<Double>
```

## Parameters

- `x`: The vector to normalize.

## Return Value

Return Value The normalized vector.

## Discussion

Discussion This function returns an undefined value if the supplied vector has zero length or is poorly scaled such that an intermediate computation overflows or underflows.

## See Also

### Geometry Functions

- [dot(_:_:)](simd/dot(_:_:)-5ifd.md)
- [project(_:_:)](simd/project(_:_:)-1uuxo.md)
- [reflect(_:n:)](simd/reflect(_:n:)-1nabs.md)
- [refract(_:n:eta:)](simd/refract(_:n:eta:)-2macj.md)