---
title: inverse
framework: metalperformanceshadersgraph
role: symbol
role_heading: Instance Property
path: metalperformanceshadersgraph/mpsgraphfftdescriptor/inverse
---

# inverse

A Boolean-valued parameter that defines the phase factor sign for Fourier transforms.

## Declaration

```swift
var inverse: Bool { get set }
```

## Discussion

Discussion When set to YES graph uses the positive phase factor: exp(+i 2Pi mu nu / n), when computing the (inverse) Fourier transform. Otherwise MPSGraph uses the negative phase factor: exp(-i 2Pi mu nu / n), when computing the Fourier transform. Default value: NO.