Contents

add(multiplication:multiplication:result:)

Calculates the double-precision element-wise addition of two vector-scalar products.

Declaration

static func add<T, U, V>(multiplication multiplicationAB: (a: T, b: Double), multiplication multiplicationCD: (c: U, d: Double), result: inout V) where T : AccelerateBuffer, U : AccelerateBuffer, V : AccelerateMutableBuffer, T.Element == Double, U.Element == Double, V.Element == Double

Parameters

  • multiplicationAB:

    A tuple that contains the vector A and the scalar value B in E = (A * B) + (C * D).

  • multiplicationCD:

    A tuple that contains the vector C and the scalar value D in E = (A * B) + (C * D).

  • result:

    The output vector E in E = (A * B) + (C * D).

Discussion

This function calculates the element-wise vector-scalar products of A and B, and C and D, and writes the sum of the products to vector D.

for (n = 0; n < N; ++n)
    E[n] = A[n]*B + C[n]*D;

[Image]

The following code shows an example of using this function:

    let count = 5
    
    let a: [Double] = [ 1,  2,  3,  4,  5]
    let b: Double = 10
    let c: [Double] = [ 5,  4,  3,  2,  1]
    let d: Double = 50
    
    let e = [Double](unsafeUninitializedCapacity: count) {
        buffer, initializedCount in
        
        vDSP.add(multiplication: (a, b), 
                 multiplication: (c, d),
                 result: &buffer)
        
        initializedCount = count
    }
    
    // Prints "[260.0, 220.0, 180.0, 140.0, 100.0]".
    print(e)

See Also

Addition