---
title: r4
framework: swiftui
role: symbol
role_heading: Instance Property
path: swiftui/colormatrix/r4
---

# r4

## Declaration

```swift
var r4: Float
```

## See Also

### Fourth column

- [g4](swiftui/colormatrix/g4.md)
- [b4](swiftui/colormatrix/b4.md)
- [a4](swiftui/colormatrix/a4.md)