---
title: "addSubtract(_:_:addResult:subtractResult:)"
framework: accelerate
role: symbol
role_heading: Type Method
path: "accelerate/vdsp/addsubtract(_:_:addresult:subtractresult:)-avzd"
---

# addSubtract(_:_:addResult:subtractResult:)

Calculates the double-precision element-wise sum and subtraction of two vectors.

## Declaration

```swift
static func addSubtract<S, T, U, V>(_ vectorA: S, _ vectorB: T, addResult: inout U, subtractResult: inout V) where S : AccelerateBuffer, T : AccelerateBuffer, U : AccelerateMutableBuffer, V : AccelerateMutableBuffer, S.Element == Double, T.Element == Double, U.Element == Double, V.Element == Double
```

## Parameters

- `vectorA`: The first input vector, A.
- `vectorB`: The second input vector, B.
- `addResult`: The addition output vector, O0.
- `subtractResult`: The subtraction output vector, O1.

## Mentioned in

Using vDSP for vector-based arithmetic

## Discussion

Discussion This function calculates the addition and subtraction of the first N elements of input vectors A and B, and writes the result to output vector C.  for (i = 0; i < N; ++i)  {      i1 = I1[i*I1S];      i0 = I0[i*I0S];      O0[i*O0S] = i0 + i1;      O1[i*O1S] = i0 - i1;  }

The following code shows an example of using this function:     let count = 5          let a: [Double] = [10, 20, 30, 40, 50]     let b: [Double] = [ 1,  2,  3,  4,  5]          var o0 = [Double](repeating: 0, count: count)     var o1 = [Double](repeating: 0, count: count)          vDSP.addSubtract(a, b, addResult: &o0, subtractResult: &o1)          // Prints the addition result: "[11.0, 22.0, 33.0, 44.0, 55.0]".     print(o0)          // Prints the subtraction result: "[9.0, 18.0, 27.0, 36.0, 45.0]".     print(o1)

## See Also

### Addition and Subtraction

- [addSubtract(_:_:addResult:subtractResult:)](accelerate/vdsp/addsubtract(_:_:addresult:subtractresult:)-6qxwa.md)