---
title: "negative(_:result:)"
framework: accelerate
role: symbol
role_heading: Type Method
path: "accelerate/vdsp/negative(_:result:)-5bwqv"
---

# negative(_:result:)

Calculates the negative value of each element in the supplied double-precision vector.

## Declaration

```swift
static func negative<U, V>(_ vector: U, result: inout V) where U : AccelerateBuffer, V : AccelerateMutableBuffer, U.Element == Double, V.Element == Double
```

## Parameters

- `vector`: The source vector.
- `result`: On output, the negative values of the elements in the source vector.

## Discussion

Discussion For example, the following code calculates the negative values of the elements of an array:     let values: [Double] = [-1, 2, -3, 4, -5, 6, -7, 8]          let negativeValues = [Double](unsafeUninitializedCapacity: values.count) {         buffer, initializedCount in                  vDSP.negative(values, result: &buffer)                  initializedCount = values.count     }          // Prints "[1.0, -2.0, 3.0, -4.0, 5.0, -6.0, 7.0, -8.0]".     print(negativeValues)

## See Also

### Vector negation functions

- [negative(_:)](accelerate/vdsp/negative(_:)-8mo1p.md)
- [negative(_:)](accelerate/vdsp/negative(_:)-24oe4.md)
- [negative(_:result:)](accelerate/vdsp/negative(_:result:)-92caw.md)