# vectorOps Perform vector and matrix BLAS functions on arrays of 128-bit vectors. ## Discussion vectorOps.h declares a set of vector and matrix BLAS functions on arrays of 128-bit vectors containing single-precision floating-point values. The arrays can be of any desired length, but the number of `float` elements must be a multiple of 4. ## Topics ### Vector-Scalar Linear Algebra Functions (from vectorOps.h) [`func vIsamax(Int32, UnsafePointer) -> Int32`](/documentation/Accelerate/vIsamax(_:_:)) Finds the position of the first vector element having the largest absolute value. [`func vIsamin(Int32, UnsafePointer) -> Int32`](/documentation/Accelerate/vIsamin(_:_:)) Finds the position of the first vector element having the smallest absolute value. [`func vIsmax(Int32, UnsafePointer) -> Int32`](/documentation/Accelerate/vIsmax(_:_:)) Finds the position of the first vector element having the maximum value. [`func vIsmin(Int32, UnsafePointer) -> Int32`](/documentation/Accelerate/vIsmin(_:_:)) Finds the position of the first vector element having the minimum value. [`func vSasum(Int32, UnsafePointer) -> Float`](/documentation/Accelerate/vSasum(_:_:)) Finds the sum of the absolute values of the elements in a vector. [`func vSsum(Int32, UnsafePointer) -> Float`](/documentation/Accelerate/vSsum(_:_:)) Finds the sum of the values of the elements in a vector. [`func vSaxpy(Int32, Float, UnsafePointer, UnsafeMutablePointer)`](/documentation/Accelerate/vSaxpy(_:_:_:_:)) Multiplies a vector by a scalar , adds it to a second vector , and stores the result in the second vector. [`func vSnaxpy(Int32, Int32, UnsafePointer, UnsafePointer, UnsafeMutablePointer)`](/documentation/Accelerate/vSnaxpy(_:_:_:_:_:)) Performs the computation of `vSaxpy` `n` times, using a different multiplier each time. [`func vScopy(Int32, UnsafePointer, UnsafeMutablePointer)`](/documentation/Accelerate/vScopy(_:_:_:)) Copies one vector to another. [`func vSdot(Int32, UnsafePointer, UnsafePointer) -> Float`](/documentation/Accelerate/vSdot(_:_:_:)) Computes the dot product of two vectors. [`func vSndot(Int32, Int32, UnsafeMutablePointer, Int32, UnsafePointer, UnsafePointer)`](/documentation/Accelerate/vSndot(_:_:_:_:_:_:)) Computes the dot products of n pairs of vectors, accumulating or storing the results in an array of `n` `float` values. [`func vSnrm2(Int32, UnsafePointer) -> Float`](/documentation/Accelerate/vSnrm2(_:_:)) Finds the Euclidean length of a vector. [`func vSnorm2(Int32, UnsafePointer) -> Float`](/documentation/Accelerate/vSnorm2(_:_:)) Finds the Euclidean length of a vector. [`func vSrot(Int32, UnsafeMutablePointer, UnsafeMutablePointer, Float, Float)`](/documentation/Accelerate/vSrot(_:_:_:_:_:)) Applies planar rotation to a set of n points whose x and y coordinates are contained in two arrays of vectors. [`func vSscal(Int32, Float, UnsafeMutablePointer)`](/documentation/Accelerate/vSscal(_:_:_:)) Scales a vector in place. [`func vSswap(Int32, UnsafeMutablePointer, UnsafeMutablePointer)`](/documentation/Accelerate/vSswap(_:_:_:)) Interchanges the elements of two vectors. [`func vSyax(Int32, Float, UnsafePointer, UnsafeMutablePointer)`](/documentation/Accelerate/vSyax(_:_:_:_:)) Multiplies each element of a vector and stores the results in a second vector. [`func vSzaxpy(Int32, Float, UnsafePointer, UnsafePointer, UnsafeMutablePointer)`](/documentation/Accelerate/vSzaxpy(_:_:_:_:_:)) Multiplies a vector by a scalar, adds it to a second vector, and stores the result in a third vector. ### Matrix-Vector Linear Algebra Functions (from vectorOps.h) [`func vSgemv(CChar, Int32, Int32, Float, UnsafePointer, UnsafePointer, Float, UnsafeMutablePointer)`](/documentation/Accelerate/vSgemv(_:_:_:_:_:_:_:_:)) Multiplies a vector by a scalar. Multiplies a matrix by another scalar, then by a second vector, and adds the resulting vector to the first vector. This function can also perform the calculation with the transpose of the original matrix instead of the matrix itself. A selector parameter determines whether the transpose is used. [`func vSgemx(Int32, Int32, Float, UnsafePointer, UnsafePointer, UnsafeMutablePointer)`](/documentation/Accelerate/vSgemx(_:_:_:_:_:_:)) Multiplies a matrix by a scalar and then by a vector, and adds the resulting vector to a second vector. [`func vSgemtx(Int32, Int32, Float, UnsafePointer, UnsafePointer, UnsafeMutablePointer)`](/documentation/Accelerate/vSgemtx(_:_:_:_:_:_:)) Forms the transpose of a matrix, multiplies it by a scalar and then by a vector, and adds the resulting vector to a second vector. ### Matrix Operations (from vectorOps.h) [`func vSgeadd(Int32, Int32, UnsafePointer, CChar, UnsafePointer, CChar, UnsafeMutablePointer)`](/documentation/Accelerate/vSgeadd(_:_:_:_:_:_:_:)) Adds two general matrices or their transposes. [`func vSgesub(Int32, Int32, UnsafePointer, CChar, UnsafePointer, CChar, UnsafeMutablePointer)`](/documentation/Accelerate/vSgesub(_:_:_:_:_:_:_:)) Subtracts two general matrices or their transposes. [`func vSgemul(Int32, Int32, Int32, UnsafePointer, CChar, UnsafePointer, CChar, UnsafeMutablePointer)`](/documentation/Accelerate/vSgemul(_:_:_:_:_:_:_:_:)) Multiplies two general matrices or their transposes. [`func vSgemm(Int32, Int32, Int32, UnsafePointer, CChar, UnsafePointer, CChar, UnsafeMutablePointer, Float, Float, UnsafeMutablePointer)`](/documentation/Accelerate/vSgemm(_:_:_:_:_:_:_:_:_:_:_:)) Multiples two general matrices or their transposes, then scales and adds a third. [`func vSgetmi(Int32, UnsafeMutablePointer)`](/documentation/Accelerate/vSgetmi(_:_:)) Transposes a matrix in place. [`func vSgetmo(Int32, Int32, UnsafePointer, UnsafeMutablePointer)`](/documentation/Accelerate/vSgetmo(_:_:_:_:)) Transposes a matrix out of place. [`func vSgevv(Int32, Int32, UnsafePointer, UnsafePointer, UnsafeMutablePointer)`](/documentation/Accelerate/vSgevv(_:_:_:_:_:)) Produces the outer product of two vectors and places the results into a matrix. --- Copyright © 2026 Apple Inc. 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