# vvnextafter(_:_:_:_:) Calculates the next machine-representable value for each element in an array of double-precision values. ``` func vvnextafter(_: UnsafeMutablePointer, _: UnsafePointer, _: UnsafePointer, _: UnsafePointer) ``` ## Discussion ### Parameters: - parameter 1: The output array, *z*. - parameter 2: The input array, *y*. - parameter 3: The direction array, *x*. - parameter 4: The number of elements in the arrays. Not all values can be represented as a floating-point value of a given precision. This function sets a value in `z[i]` that is either minimally larger than the value in `y[i]` (if `x[i]` is larger than `y[i]`) or minimally smaller than the value in `y[i]` (if `x[i]` is smaller than `y[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)