---
title: "simd_make_char4_undef(_:)"
framework: simd
role: symbol
role_heading: Function
path: "simd/simd_make_char4_undef(_:)-99pql"
---

# simd_make_char4_undef(_:)

Returns a new vector with the first element set to a scalar value, and other elements undefined.

## Declaration

```swift
func simd_make_char4_undef(_ other: CChar) -> simd_char4
```

## See Also

### Functions to Create Four-Element Vectors From Scalar Values

- [simd_make_char4(_:)](simd/simd_make_char4(_:)-8kfe3.md)
- [simd_make_char4(_:_:_:_:)](simd/simd_make_char4(_:_:_:_:).md)