# vSgesub(_:_:_:_:_:_:_:) Subtracts two general matrices or their transposes. ``` func vSgesub(_ height: Int32, _ width: Int32, _ a: UnsafePointer, _ forma: CChar, _ b: UnsafePointer, _ formb: CChar, _ c: UnsafeMutablePointer) ``` ## Parameters `height` number of rows in the matrices to be subtracted; must be a multiple of 4. `width` number of columns in the matrices to be subtracted; 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 `height` rows and `width` columns. If `forma` = ‘T’, the transpose is used and `a` has `width` rows and `height` columns. `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 `height` rows and `width` columns. If `formb` = ‘T’, the transpose is used and `b` has `width` rows and `height` columns. `formb` selector with a value of ‘N’ or ‘T’. `c` destination matrix with `height` rows and `width` columns. ## Discussion Matrix `b` (or its transpose) is subtracted from matrix `a` (or its transpose); the result is stored in mactrix `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)