# multiply(_:_:) Returns the single-precision element-wise product of a vector and a scalar value. ``` static func multiply(_ scalar: Float, _ vector: U) -> [Float] where U : AccelerateBuffer, U.Element == Float ``` ## Parameters `scalar` The input scalar value, `B`. `vector` The input vector, `A`. ## Return Value The output vector, `C`. ## Discussion This function calculates the element-wise product of vector `A` and scalar value `B`, and writes the result to vector `C`. ```swift for (n = 0; n < N; ++n) C[n] = A[n] * B; ``` ![A diagram showing the operation of this function. There are three rows. The top row represents the input vector A with three boxes, and the scalar value B with one box. The middle row represents the operation as three boxes with multiplication signs. The bottom row represents the output vector C as three boxes. The diagram has connecting lines from the input vectors to the operation, and from the operation to the output vector.](images/com.apple.accelerate/media-4337183@2x.png) The following code shows an example of using this function: ```swift let a: [Float] = [1, 2, 3, 4, 5] let b: Float = 10 let c = vDSP.multiply(b, a) // Prints "[10.0, 20.0, 30.0, 40.0, 50.0]". print(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)