---
title: "simd_make_long4_undef(_:)"
framework: simd
role: symbol
role_heading: Function
path: "simd/simd_make_long4_undef(_:)-31uo1"
---

# simd_make_long4_undef(_:)

Returns a new vector from the specified two-element vector, and other elements undefined.

## Declaration

```swift
func simd_make_long4_undef(_ other: simd_long2) -> simd_long4
```

## See Also

### Functions to Create Four-Element Vectors From Other Vectors

- [simd_make_long4(_:)](simd/simd_make_long4(_:)-98er2.md)
- [simd_make_long4(_:)](simd/simd_make_long4(_:)-94zwx.md)
- [simd_make_long4(_:)](simd/simd_make_long4(_:)-8op7o.md)
- [simd_make_long4(_:)](simd/simd_make_long4(_:)-9tamg.md)
- [simd_make_long4(_:_:)](simd/simd_make_long4(_:_:)-51qs4.md)
- [simd_make_long4_undef(_:)](simd/simd_make_long4_undef(_:)-345km.md)