---
title: "subtract(multiplication:_:)"
framework: accelerate
role: symbol
role_heading: Type Method
path: "accelerate/vdsp/subtract(multiplication:_:)-2hhme"
---

# subtract(multiplication:_:)

Calculates the double-precision element-wise difference of the product of a vector and a scalar value, and a vector.

## Declaration

```swift
static func subtract<T, U>(multiplication: (a: U, b: Double), _ vector: T) -> [Double] where T : AccelerateBuffer, U : AccelerateBuffer, T.Element == Double, U.Element == Double
```

## Parameters

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

## Return Value

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

## Discussion

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

The following code shows an example of using this function:

let a: [Double] = [ 1,  2,  3,  4,  5]     let b: Double = 10     let c: [Double] = [ 5,  4,  3,  2,  1]          let d = vDSP.subtract(multiplication: (a, b),                           c)          // Prints "[5.0, 16.0, 27.0, 38.0, 49.0]".     print(d)

## See Also

### Subtraction

- [subtract(_:_:)](accelerate/vdsp/subtract(_:_:)-8o5ai.md)
- [subtract(_:_:)](accelerate/vdsp/subtract(_:_:)-9xmo8.md)
- [subtract(_:_:result:)](accelerate/vdsp/subtract(_:_:result:)-1ianx.md)
- [subtract(_:_:result:)](accelerate/vdsp/subtract(_:_:result:)-2p3fa.md)
- [subtract(_:from:count:result:)](accelerate/vdsp/subtract(_:from:count:result:)-4p5xd.md)
- [subtract(_:from:count:result:)](accelerate/vdsp/subtract(_:from:count:result:)-80zi9.md)
- [subtract(multiplication:_:)](accelerate/vdsp/subtract(multiplication:_:)-9gphg.md)
- [subtract(multiplication:_:)](accelerate/vdsp/subtract(multiplication:_:)-3zm6l.md)
- [subtract(multiplication:_:)](accelerate/vdsp/subtract(multiplication:_:)-6u3sp.md)
- [subtract(multiplication:_:result:)](accelerate/vdsp/subtract(multiplication:_:result:)-9p12h.md)
- [subtract(multiplication:_:result:)](accelerate/vdsp/subtract(multiplication:_:result:)-86gx3.md)
- [subtract(multiplication:_:result:)](accelerate/vdsp/subtract(multiplication:_:result:)-3f2bw.md)
- [subtract(multiplication:_:result:)](accelerate/vdsp/subtract(multiplication:_:result:)-6b91s.md)
- [subtract(multiplication:multiplication:)](accelerate/vdsp/subtract(multiplication:multiplication:)-22a4b.md)
- [subtract(multiplication:multiplication:)](accelerate/vdsp/subtract(multiplication:multiplication:)-1ghyu.md)