vDSP_vmulD

Declaration

extern void vDSP_vmulD(const double *__A, vDSP_Stride __IA, const double *__B, vDSP_Stride __IB, double *__C, vDSP_Stride __IC, vDSP_Length __N);

Parameters

• __A:

  The first input vector, A.

• __IA:

  The distance between the elements in the first input vector.

• __B:

  The second input vector, B.

• __IB:

  The distance between the elements in the second input vector.

• __C:

  The output vector, C.

• __IC:

  The distance between the elements in the output vector.

• __N:

  The number of elements that the function processes.

Discussion

This function calculates the products of the first N elements of input vectors A and B, and writes the result to output vector C.

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

[Image]

The following code shows an example of using this function:

    let stride = 1
    let count = 5
    
    let a: [Double] = [ 1,  2,  3,  4,  5]
    let b: [Double] = [10, 20, 30, 40, 50]
    
    let c = [Double](unsafeUninitializedCapacity: count) {
        buffer, initializedCount in
        
        vDSP_vmulD(a, stride,
                   b, stride,
                   buffer.baseAddress!, stride,
                   vDSP_Length(count))
        
        initializedCount = count
    }
    
    // Prints "[10.0, 40.0, 90.0, 160.0, 250.0]".
    print(c)

See Also

Binary multiplication operations

• vDSP_vmul