---
title: range
framework: phase
role: symbol
role_heading: Instance Property
path: phase/phaseenvelope/range
---

# range

The bounds of the output value.

## Declaration

```swift
var range: PHASENumericPair { get }
```

## Discussion

Discussion This property is an ordered pair that defines the range of possible output values along the y axis for the evaluate(x:) function. The first number in the pair is the minimum output value, and the second number in the pair is the maximum output value.

## See Also

### Bounding the Input

- [domain](phase/phaseenvelope/domain.md)