---
title: "vlogbf(_:)"
framework: accelerate
role: symbol
role_heading: Function
path: "accelerate/vlogbf(_:)"
---

# vlogbf(_:)

For each vector element, extracts the exponent of X, as a signed integral value. A subnormal argument is treated as though it were first normalized. Thus:   1  <=  x * 2^(-logb(x))  <  2.

## Declaration

```swift
func vlogbf(_: vFloat) -> vFloat
```

## See Also

### Exponential and Logarithmic Functions (from vfp.h)

- [vexpf(_:)](accelerate/vexpf(_:).md)
- [vexp2f(_:)](accelerate/vexp2f(_:).md)
- [vexpm1f(_:)](accelerate/vexpm1f(_:).md)
- [vlogf(_:)](accelerate/vlogf(_:).md)
- [vlog1pf(_:)](accelerate/vlog1pf(_:).md)
- [vlog10f(_:)](accelerate/vlog10f(_:).md)
- [vlog2f(_:)](accelerate/vlog2f(_:).md)
- [vvpows(_:_:_:_:)](accelerate/vvpows(_:_:_:_:).md)
- [vvpowsf(_:_:_:_:)](accelerate/vvpowsf(_:_:_:_:).md)
- [vscalbf(_:_:)](accelerate/vscalbf(_:_:).md)