---
title: "init(_:_:)"
framework: swift
role: symbol
role_heading: Initializer
path: "swift/simd4/init(_:_:)"
---

# init(_:_:)

A four-element vector created by appending a scalar to a three-element vector.

## Declaration

```swift
init(_ xyz: SIMD3<Scalar>, _ w: Scalar)
```