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# multiply(_:_:)

Returns the double-precision element-wise product of two vectors.

```
static func multiply<T, U>(_ vectorA: T, _ vectorB: U) -> [Double] where T : AccelerateBuffer, U : AccelerateBuffer, T.Element == Double, U.Element == Double
```

## Parameters

`vectorA`

The first input vector, `A`.

`vectorB`

The second input vector, `B`.

## Return Value

The output vector, `C`.

## 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`.

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

![A diagram showing the operation of this function. There are three rows. The top row represents the input vectors, A and B, with three boxes of each. The middle row represents the operation as three boxes with multiplication signs. The bottom row represents the output vector C as three boxes. The diagram has connecting lines from the input vectors to the operation, and from the operation to the output vectors.](images/com.apple.accelerate/media-4336905@2x.png)

The following code shows an example of using this function:

```swift
    let a: [Double] = [10, 20, 30, 40, 50]
    let b: [Double] = [ 1,  2,  3,  4,  5]
    
    let c = vDSP.multiply(a, b)
    
    // Prints "[10.0, 40.0, 90.0, 160.0, 250.0]".
    print(c)
```

---

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