# Questions about vector
**URL:** https://discourse.julialang.org/t/questions-about-vector/88153
**Category:** New to Julia
**Tags:** question, arrays
**Created:** [October 3, 2022, 11:49am UTC](https://discourse.julialang.org/t/questions-about-vector/88153 "2022-10-03T11:49:36Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@zhangchunyong](https://discourse.julialang.org/u/zhangchunyong)
#### Post date: [October 3, 2022, 11:49am UTC](https://discourse.julialang.org/t/questions-about-vector/88153/1 "2022-10-03T11:49:36Z")
```julia
a=[[1],[1,2],[2,1],[2,5],[111,3],[4,1]]
6-element Vector{Vector{Int64}}:
[1]
[1, 2]
[2, 1]
[2, 5]
[111, 3]
[4, 1]
```
I want to get the index which of them contain a element named 1,but 111 is not allowed.I want to return [1,2,3,6] .If the sub-vector contains real 1 ,I will return the index. What should I do ? Thanks very much.
findall?
---
### Author:  [@JorizovdZ](https://discourse.julialang.org/u/JorizovdZ)
#### Post date: [October 3, 2022, 12:00pm UTC](https://discourse.julialang.org/t/questions-about-vector/88153/2 "2022-10-03T12:00:01Z")
I do not know how you want to approach this as `a` is a vector of vectors.
Though something like this does work:
```julia
findall.(x -> x == 1, a)
```
---
### Author:  [@zhangchunyong](https://discourse.julialang.org/u/zhangchunyong)
#### Post date: [October 3, 2022, 12:01pm UTC](https://discourse.julialang.org/t/questions-about-vector/88153/3 "2022-10-03T12:01:59Z")
> [@JorizovdZ](#):
>
> `findall.(x -> x == 1, a)`
```julia
findall.(x -> x == 1, a)
6-element Vector{Vector{Int64}}:
[1]
[1]
[2]
[1]
[]
[2]
```
Sorry, It cannot return the index. like [1,2,3,6]
---
### Author:  [@lmiq](https://discourse.julialang.org/u/lmiq)
#### Post date: [October 3, 2022, 12:02pm UTC](https://discourse.julialang.org/t/questions-about-vector/88153/4 "2022-10-03T12:02:50Z")
```julia
julia> findall(x -> 1 in x, a)
4-element Vector{Int64}:
1
2
3
6
```
---
### Author:  [@DNF](https://discourse.julialang.org/u/DNF)
#### Post date: [October 3, 2022, 12:02pm UTC](https://discourse.julialang.org/t/questions-about-vector/88153/5 "2022-10-03T12:02:50Z")
> [@zhangchunyong](#):
>
> `a=[[1],[1,2],[2,1],[2,5],[111,3],[4,1]]`
```julia
julia> findall(1 in v for v in a)
4-element Vector{Int64}:
1
2
3
6
```
---
### Author:  [@rafael.guerra](https://discourse.julialang.org/u/rafael.guerra)
#### Post date: [October 4, 2022, 7:15pm UTC](https://discourse.julialang.org/t/questions-about-vector/88153/6 "2022-10-04T19:15:41Z")
An alternative:
```julia
LinearIndices(a)[in.(1, a)]
```