---
title: "simd_make_double8_undef(_:)"
framework: simd
role: symbol
role_heading: Function
path: "simd/simd_make_double8_undef(_:)-5rmk5"
---

# simd_make_double8_undef(_:)

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

## Declaration

```swift
func simd_make_double8_undef(_ other: Double) -> simd_double8
```

## See Also

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

- [simd_make_double8(_:)](simd/simd_make_double8(_:)-56g8y.md)