---
title: "simd_mul(_:_:)"
framework: simd
role: symbol
role_heading: Function
path: "simd/simd_mul(_:_:)-428fx"
---

# simd_mul(_:_:)

## Declaration

```swift
func simd_mul(_ a: Float16, _ q: simd_quath) -> simd_quath
```

## Discussion

Discussion The quaternion q scaled by the real value a.