# vSgemul(_:_:_:_:_:_:_:_:) Multiplies two general matrices or their transposes. ``` func vSgemul(_ l: Int32, _ m: Int32, _ n: Int32, _ a: UnsafePointer, _ forma: CChar, _ b: UnsafePointer, _ formb: CChar, _ matrix: UnsafeMutablePointer) ``` ## Parameters `l` number of rows in matrix `matrix`; must be a multiple of 4. `m` if `forma` = ‘N’, `m` is the number of columns in matrix `a` ; if forma = ‘T’, `m` is the number of rows in matrix `a`. Also, if `formb` = ‘N’, `m` is the number of rows in matrix `b`; if formb = ‘T’, `m` is the number of columns in matrix `b`. `m` must be a multiple of 4. `n` number of columns in the matrix `matrix`; must be a multiple of 4. `a` a matrix with elements of type `float`. If `forma` = ‘N’, the matrix itself is used in the calculation and it has `l` rows and `m` columns. If `forma` = ‘T’, the transpose is used and `a` has `m` rows and `l` columns. Thus the matrix used in the calculation is `l` by `m`. `forma` selector with a value of ‘N’ or ‘T’. `b` a matrix with elements of type `float`. If `formb` = ‘N’, the matrix itself is used in the calculation and it has `m` rows and `n` columns. If `formb` = ‘T’, the transpose is used and `b` has `n` rows and `m` columns. Thus the matrix used in the calculation is `m` by `n`. `formb` selector with a value of ‘N’ or ‘T’. `matrix` destination matrix with `l` rows and `n` columns. ## Discussion Matrix `a` (or its transpose) is multiplied by matrix `b` (or its transpose); the result is stored in matrix `matrix`. --- 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)