---
title: "simd_make_long3_undef(_:)"
framework: simd
role: symbol
role_heading: Function
path: "simd/simd_make_long3_undef(_:)-4ehx"
---

# simd_make_long3_undef(_:)

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

## Declaration

```swift
func simd_make_long3_undef(_ other: simd_long1) -> simd_long3
```

## See Also

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

- [simd_make_long3(_:)](simd/simd_make_long3(_:)-1n0vi.md)
- [simd_make_long3(_:_:_:)](simd/simd_make_long3(_:_:_:).md)