# Sliding-window reduction functions Calculate maximum values and sums of values in a sliding window. ## Topics ### Sliding-window maximum functions The functions in this group find the maximum value in a sliding window within an input vector. [`vDSP_vswmax`](/documentation/Accelerate/vDSP_vswmax) Finds the maximum value in a sliding window at each possible position in a single-precision input vector. [`vDSP_vswmaxD`](/documentation/Accelerate/vDSP_vswmaxD) Finds the maximum value in a sliding window at each possible position in a double-precision input vector. ### Sliding-window summation functions The functions in this group calculate a sliding-window sum for a vector. [`slidingWindowSum(_:usingWindowLength:)`](/documentation/Accelerate/vDSP/slidingWindowSum(_:usingWindowLength:)-2t1dc) Returns the double-precision sliding window sum of a vector. [`slidingWindowSum(_:usingWindowLength:)`](/documentation/Accelerate/vDSP/slidingWindowSum(_:usingWindowLength:)-reb8) Returns the single-precision sliding window sum of a vector. [`slidingWindowSum(_:usingWindowLength:result:)`](/documentation/Accelerate/vDSP/slidingWindowSum(_:usingWindowLength:result:)-i972) Calculates the double-precision sliding window sum of a vector. [`slidingWindowSum(_:usingWindowLength:result:)`](/documentation/Accelerate/vDSP/slidingWindowSum(_:usingWindowLength:result:)-5tg0h) Calculates the single-precision sliding window sum of a vector. [`vDSP_vswsum`](/documentation/Accelerate/vDSP_vswsum) Finds the sum of values in a sliding window at each possible position in a single-precision input vector. [`vDSP_vswsumD`](/documentation/Accelerate/vDSP_vswsumD) Finds the sum of values in a sliding window at each possible position in a double-precision input vector. --- 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)