# Selectperm bug or wrong documentation?
**URL:** https://discourse.julialang.org/t/selectperm-bug-or-wrong-documentation/12852
**Category:** Internals & Design
**Created:** [August 3, 2018, 9:01am UTC](https://discourse.julialang.org/t/selectperm-bug-or-wrong-documentation/12852 "2018-08-03T09:01:51Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Wikunia](https://discourse.julialang.org/u/Wikunia)
#### Post date: [August 3, 2018, 9:01am UTC](https://discourse.julialang.org/t/selectperm-bug-or-wrong-documentation/12852/1 "2018-08-03T09:01:51Z")
I think the behavior of `selectperm` does not fully match the documentation:
Link to documentation:
>
If I have the array `a = [4,3,2,1]` and use `selectperm(a,2)` I can read this part:
> If `k` is a single index (Integer), an array of the first `k` indices is returned;
then the expected behavior is: to get `[4,3]` as `a[[4,3]]` is `[1,2]` but regarding this:
> Also note that this is equivalent to, but more efficient than, calling
> `sortperm(...)[k]`.
I would suspect to get only a single index (`3`) which is what `selectperm` actually does.
Using it without documentation I assumed to get `[4,3]` but I’m also happy to use `selectperm(a,1:2)`. Anyway the documentation seems to be wrong.
---
### Author:  [@StefanKarpinski](https://discourse.julialang.org/u/StefanKarpinski)
#### Post date: [August 3, 2018, 12:46pm UTC](https://discourse.julialang.org/t/selectperm-bug-or-wrong-documentation/12852/2 "2018-08-03T12:46:30Z")
Could you file a GitHub issue about this so it doesn’t get lost?
---
### Author:  [@Wikunia](https://discourse.julialang.org/u/Wikunia)
#### Post date: [August 3, 2018, 12:57pm UTC](https://discourse.julialang.org/t/selectperm-bug-or-wrong-documentation/12852/3 "2018-08-03T12:57:31Z")
Sure I would also do a PR if the behavior is as expected and only the docstring should be changed.
Issue:
[https://github.com/JuliaLang/julia/issues/28426](https://github.com/JuliaLang/julia/issues/28426)