---
title: "computeDistance(_:to:)"
framework: vision
role: symbol
role_heading: Instance Method
path: "vision/vnfeatureprintobservation/computedistance(_:to:)"
---

# computeDistance(_:to:)

Computes the distance between two feature print observations.

## Declaration

```swift
func computeDistance(_ outDistance: UnsafeMutablePointer<Float>, to featurePrint: VNFeaturePrintObservation) throws
```

## Parameters

- `outDistance`: A pointer to store the calculated distance value.
- `featurePrint`: The feature print object whose distance to calculate.

## Discussion

Discussion Shorter distances indicate greater similarity between feature prints.