# copy(_:to:count:) Copies a complex double-precision vector. ``` static func copy(_ source: DSPDoubleSplitComplex, to destination: inout DSPDoubleSplitComplex, count: Int) ``` ## Parameters `source` The source complex vector. `destination` The destination complex vector. `count` The number of complex elements in the source and destination vectors. ## Discussion The following code copies the complex elements in the source to the destination: ```swift let realSrc = UnsafeMutableBufferPointer.allocate(capacity: 4) _ = realSrc.initialize(from: [0, 2, 4, 6]) let imagSrc = UnsafeMutableBufferPointer.allocate(capacity: 4) _ = imagSrc.initialize(from: [1, 3, 5, 7]) let source = DSPDoubleSplitComplex(realp: realSrc.baseAddress!, imagp: imagSrc.baseAddress!) let realDst = UnsafeMutableBufferPointer.allocate(capacity: 4) let imagDst = UnsafeMutableBufferPointer.allocate(capacity: 4) var destination = DSPDoubleSplitComplex(realp: realDst.baseAddress!, imagp: imagDst.baseAddress!) vDSP.copy(source, to: &destination, count: 4) print(Array(realDst)) // Prints "[0.0, 2.0, 4.0, 6.0]". print(Array(imagDst)) // Prints "[1.0, 3.0, 5.0, 7.0]". ``` --- 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)