# How to reinterpret Float64 as two Float32's
**URL:** https://discourse.julialang.org/t/how-to-reinterpret-float64-as-two-float32s/10808
**Category:** General Usage
**Tags:** question
**Created:** [May 10, 2018, 12:41am UTC](https://discourse.julialang.org/t/how-to-reinterpret-float64-as-two-float32s/10808 "2018-05-10T00:41:13Z")
**Posts on this page:** 5
**Page:** 1
### Author:  [@magzpavz](https://discourse.julialang.org/u/magzpavz)
#### Post date: [May 10, 2018, 12:41am UTC](https://discourse.julialang.org/t/how-to-reinterpret-float64-as-two-float32s/10808/1 "2018-05-10T00:41:13Z")
`reinterpret` can slice an Int64 into two Int32’s. Is there a way to do this for floats?
Relatedly, is there an inverse of `bits`?
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### Author:  [@rdeits](https://discourse.julialang.org/u/rdeits)
#### Post date: [May 10, 2018, 1:29am UTC](https://discourse.julialang.org/t/how-to-reinterpret-float64-as-two-float32s/10808/2 "2018-05-10T01:29:15Z")
You can do this by wrapping the Float64 in an array:
```julia
julia> reinterpret(Float32, [1.0])
2-element Array{Float32,1}:
0.0
1.875
```
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### Author:  [@Palli](https://discourse.julialang.org/u/Palli)
#### Post date: [May 10, 2018, 4:01pm UTC](https://discourse.julialang.org/t/how-to-reinterpret-float64-as-two-float32s/10808/3 "2018-05-10T16:01:07Z")
> [@magzpavz](#):
>
> reinterpret can slice an Int64 into two Int32’s.
Yes, and that’s useful, but I doubt it is for floats, even though you can (just interpreting the upper and lower bits).
I’m just curious, what are you really trying to do?
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### Author:  [@magzpavz](https://discourse.julialang.org/u/magzpavz)
#### Post date: [May 10, 2018, 6:35pm UTC](https://discourse.julialang.org/t/how-to-reinterpret-float64-as-two-float32s/10808/4 "2018-05-10T18:35:09Z")
I have some data I saved off an instrument. The file format is not well documented. I knew that the file starts with the model and serial number of the instrument, and then a list of the instrument settings, which are a mix of Int32’s, Float32’s and Float64’s. As I read out the file, if I get a value that seems wacky, I want to reinterpret it.
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### Author:  [@simonbyrne](https://discourse.julialang.org/u/simonbyrne)
#### Post date: [May 10, 2018, 6:36pm UTC](https://discourse.julialang.org/t/how-to-reinterpret-float64-as-two-float32s/10808/5 "2018-05-10T18:36:38Z")
To avoid the array allocation overhead, you can also do:
```julia
u = reinterpret(UInt64, x)
y1 = reinterpret(Float32, (u >> 32) % UInt32)
y2 = reinterpret(Float32, u % UInt32)
```