---
title: "GLKQuaternionLength(_:)"
framework: GLKit
role: symbol
role_heading: Function
platforms: [iOS 5.0+, iPadOS 5.0+, macOS 10.8+, tvOS 9.0+]
path: "glkit/glkquaternionlength(_:)"
---

# GLKQuaternionLength(_:)

Returns the length of a quaternion.

## Declaration

```swift
func GLKQuaternionLength(_ quaternion: GLKQuaternion) -> Float
```

## Parameters

- `quaternion`: A quaternion.

## Return Value

Return Value The length of the quaternion.

## See Also

### Retrieving Information About a Quaternion

- [GLKQuaternionAxis(_:)](glkit/glkquaternionaxis(_:).md)
- [GLKQuaternionAngle(_:)](glkit/glkquaternionangle(_:).md)