# formWindow(usingSequence:result:isHalfWindow:) Populates a single-precision vector with a specified window. ``` static func formWindow(usingSequence sequence: vDSP.WindowSequence, result: inout V, isHalfWindow: Bool) where V : AccelerateMutableBuffer, V.Element == Float ``` ## Parameters `sequence` The window sequence to use for generation. `result` The destination vector that receives the result. `isHalfWindow` A Boolean value that specifies whether the function generates half of the number of elements. ## Discussion Use this function to populate a vector with values of a specified window sequence. The following code shows how to generate a single-precision Blackman window: ```swift var c = [Float](repeating: 0, count: 1024) vDSP.formWindow(usingSequence: .blackman, result: &c, isHalfWindow: false) ``` The following figure illustrates the values of the output vector, `c`:  --- 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)