---
title: "convert(rectangularCoordinates:toPolarCoordinates:)"
framework: accelerate
role: symbol
role_heading: Type Method
path: "accelerate/vdsp/convert(rectangularcoordinates:topolarcoordinates:)-1zi4t"
---

# convert(rectangularCoordinates:toPolarCoordinates:)

Converts single-precision rectangular coordinates to polar coordinates.

## Declaration

```swift
static func convert<U, V>(rectangularCoordinates: U, toPolarCoordinates polarCoordinates: inout V) where U : AccelerateBuffer, V : AccelerateMutableBuffer, U.Element == Float, V.Element == Float
```

## Parameters

- `rectangularCoordinates`: The source rectangular coordinates.
- `polarCoordinates`: On output, the polar coordinates.

## Discussion

Discussion The function calls the underlying vDSP_polarD function to convert the input angle-radius pairs to Cartesian x-y pairs. The following code shows how to convert a set of Cartesian coordinates to its angle-radius pair (with the angle specified in degress) equivalent:     let rectangularCoordinates = [ 5.0, 5.0 ]

let polarCoordinates = [Double](unsafeUninitializedCapacity: 2) {         buffer,initializedCount in                  vDSP.convert(             rectangularCoordinates: rectangularCoordinates,             toPolarCoordinates: &buffer         )                  initializedCount = 2     }          let radius = polarCoordinates[0]     let angle = Measurement(value: polarCoordinates[1],                             unit: UnitAngle.radians)         .converted(to: UnitAngle.degrees)         .value          // Prints "7.07 45.0".     print(radius, angle)

## See Also

### Converting rectangular coordinates to polar coordinates

- [rectangularToPolar(_:)](accelerate/vdsp/rectangulartopolar(_:)-5p4kg.md)
- [rectangularToPolar(_:)](accelerate/vdsp/rectangulartopolar(_:)-3txg1.md)
- [convert(rectangularCoordinates:toPolarCoordinates:)](accelerate/vdsp/convert(rectangularcoordinates:topolarcoordinates:)-84131.md)