# vSgemx(_:_:_:_:_:_:) Multiplies a matrix by a scalar and then by a vector, and adds the resulting vector to a second vector. ``` func vSgemx(_ m: Int32, _ n: Int32, _ alpha: Float, _ a: UnsafePointer, _ x: UnsafePointer, _ y: UnsafeMutablePointer) ``` ## Parameters `m` number of rows in `a`, and the length of vector `y`; must be a multiple of 4. `n` number of columns in `a`, and the length of vector `x`; must be a multiple of 4. `alpha` scalar multiplier for matrix `a`. `a` `m` by `n` matrix with elements of type `float`. `x` vector with elements of type `float`. `y` destination vector with `n` elements of type `float`. ## Discussion Matrix `a` is multiplied by `alpha` and then by vector `x`; the resulting vector is added to vector `y`, and the results are stored in `y`. --- 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)