# init(lowHalf:highHalf:) A vector formed by concatenating lowHalf and highHalf. ``` init(lowHalf: SIMD16, highHalf: SIMD16) ``` ## Discussion Equivalent to: ``` var result = SIMD32() for i in 0..<16 { result[i] = lowHalf[i] result[16+i] = highHalf[i] } ``` --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)