# Broadcast macro "breaks" norm
**URL:** https://discourse.julialang.org/t/broadcast-macro-breaks-norm/35570
**Category:** General Usage
**Created:** [March 5, 2020, 11:24am UTC](https://discourse.julialang.org/t/broadcast-macro-breaks-norm/35570 "2020-03-05T11:24:30Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@cshen](https://discourse.julialang.org/u/cshen)
#### Post date: [March 5, 2020, 11:24am UTC](https://discourse.julialang.org/t/broadcast-macro-breaks-norm/35570/1 "2020-03-05T11:24:30Z")
Hello,
I found this rather interesting behaviour
```julia
julia> using LinearAlgebra
julia> a = [0, 0, 1]
3-element Array{Int64,1}:
0
0
1
julia> @. a/norm(a)
3-element Array{Float64,1}:
NaN
NaN
1.0
julia> a./norm(a)
3-element Array{Float64,1}:
0.0
0.0
1.0
```
Only when i tried with `a=[0, 4, 4]` and got out `@. a/norm(a) ` returned `[NaN, 1.0, 1.0]` that i realised that the broadcasting was being passed to `norm` as well.
This is a rather simplistic case but this renders using `@.` over expressions that use the `norm` completely useless, so we can’t take advantage of the performances of fusing broadcasting calls.
I assumed that norm would only work for vectors and up, since for scalars one could just use `abs`.
The quotes over breaks are because i realise that the norm behaving this way make sense, but still, as i said above one could just use abs to take the norm of a scalar value.
Is there a reason it is this way?
---
### Author:  [@cstjean](https://discourse.julialang.org/u/cstjean)
#### Post date: [March 5, 2020, 11:51am UTC](https://discourse.julialang.org/t/broadcast-macro-breaks-norm/35570/2 "2020-03-05T11:51:02Z")
`@.` will add a dot everywhere unless there is a `$` sign before the function. `@. a / $norm(a)` does what you want.