# init(count:data:) Creates a new vector of double-precision values. ``` init(count: Int32, data: UnsafeMutablePointer) ``` ## Parameters `count` The number of items in the vector. `data` The array of double-precision, floating-point values. --- 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)