# absolute(_:result:) Calculates the absolute value of each element in the supplied double-precision complex vector. ``` static func absolute(_ vector: DSPDoubleSplitComplex, result: inout V) where V : AccelerateMutableBuffer, V.Element == Double ``` ## Parameters `vector` The source vector. `result` On output, the absolute values of the elements in the source vector. ## Discussion This function returns the square roots of the sum of the squares of the real and imaginary parts of each complex element. For example, the following code calculates the absolute values of four complex numbers: ```swift let n = 4 let reals = UnsafeMutableBufferPointer.allocate(capacity: n) _ = reals.initialize(from: [ -3, -6, 5, 9 ]) let imaginaries = UnsafeMutableBufferPointer.allocate(capacity: n) _ = imaginaries.initialize(from: [ 4, -8, -12, 12 ]) let values = DSPDoubleSplitComplex(realp: reals.baseAddress!, imagp: imaginaries.baseAddress!) let absoluteValues = [Double](unsafeUninitializedCapacity: n) { buffer, initializedCount in vDSP.absolute(values, result: &buffer) initializedCount = n } // Prints "[5.0, 10.0, 13.0, 15.0]". print(absoluteValues) ``` --- 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)