---
title: "simd_quaternion(_:)"
framework: simd
role: symbol
role_heading: Function
path: "simd/simd_quaternion(_:)-9c4np"
---

# simd_quaternion(_:)

## Declaration

```swift
func simd_quaternion(_ matrix: simd_half4x4) -> simd_quath
```

## Discussion

Discussion Construct a quaternion from a 4x4 rotation matrix. The last row and column of the matrix are ignored. This function is equivalent to calling simd_quaternion with the upper-left 3x3 submatrix                .