---
title: "multiply(subtraction:_:)"
framework: accelerate
role: symbol
role_heading: Type Method
path: "accelerate/vdsp/multiply(subtraction:_:)-106pt"
---

# multiply(subtraction:_:)

Returns the single-precision element-wise product of the difference of two vectors and a scalar value.

## Declaration

```swift
static func multiply<T, U>(subtraction: (a: T, b: U), _ scalar: Float) -> [Float] where T : AccelerateBuffer, U : AccelerateBuffer, T.Element == Float, U.Element == Float
```

## Parameters

- `subtraction`: A tuple that contains the vectors A and B in D = (A - B) * C.
- `scalar`: The input scalar value C in D = (A - B) * C.

## Mentioned in

Using vDSP for vector-based arithmetic

## Return Value

Return Value The output vector D in D = (A - B) * C.

## Discussion

Discussion This function calculates the element-wise difference of vectors A and B, multiplies the difference by scalar value C, and writes the result to vector D.  for (n = 0; n < N; ++n)     D[n] = (A[n] - B[n]) * C;

The following code shows an example of using this function:     let a: [Float] = [ 1,  2,  3,  4,  5]     let b: [Float] = [10, 20, 30, 40, 50]     let c: Float = 5          let d = vDSP.multiply(subtraction: (a, b),                           c)          // Prints "[-45.0, -90.0, -135.0, -180.0, -225.0]".     print(d)

## See Also

### Multiplication

- [multiply(_:_:)](accelerate/vdsp/multiply(_:_:)-9dxnc.md)
- [multiply(_:_:)](accelerate/vdsp/multiply(_:_:)-1ckqt.md)
- [multiply(_:_:)](accelerate/vdsp/multiply(_:_:)-993yp.md)
- [multiply(_:_:)](accelerate/vdsp/multiply(_:_:)-9zgw.md)
- [multiply(_:_:result:)](accelerate/vdsp/multiply(_:_:result:)-4xorc.md)
- [multiply(_:_:result:)](accelerate/vdsp/multiply(_:_:result:)-358cn.md)
- [multiply(_:_:result:)](accelerate/vdsp/multiply(_:_:result:)-3ptjl.md)
- [multiply(_:_:result:)](accelerate/vdsp/multiply(_:_:result:)-155f3.md)
- [multiply(_:by:count:useConjugate:result:)](accelerate/vdsp/multiply(_:by:count:useconjugate:result:)-4idx8.md)
- [multiply(_:by:count:useConjugate:result:)](accelerate/vdsp/multiply(_:by:count:useconjugate:result:)-79r8u.md)
- [multiply(_:by:result:)](accelerate/vdsp/multiply(_:by:result:)-8b9eq.md)
- [multiply(_:by:result:)](accelerate/vdsp/multiply(_:by:result:)-8jyhd.md)
- [multiply(addition:_:)](accelerate/vdsp/multiply(addition:_:)-4c9in.md)
- [multiply(addition:_:)](accelerate/vdsp/multiply(addition:_:)-1wt61.md)
- [multiply(addition:_:)](accelerate/vdsp/multiply(addition:_:)-4fnbx.md)