# vvrsqrtf(_:_:_:) Calculates the reciprocal square root of each element in an array of single-precision values. ``` func vvrsqrtf(_: UnsafeMutablePointer, _: UnsafePointer, _: UnsafePointer) ``` ## Discussion ### Parameters: - parameter 1: The output array, *y*. - parameter 2: The input array, *x*. - parameter 3: The number of elements in the arrays. The following code shows an example of using [`vvrsqrtf(_:_:_:)`](/documentation/Accelerate/vvrsqrtf(_:_:_:)). ```swift var x: [Float] = [100, 10000, 64, 144] var y = [Float](repeating: 0, count: x.count) var n = Int32(x.count) vvrsqrtf(&y, &x, &n) print(y) // [0.1, 0.01, 0.125, 0.0833] ``` --- 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)