how about this? ``` julia> a = [1,2,3,10,20,30,100,200,300]
julia> r = reshape(a,3,3)
3x3 Array{Int64,2}:
1 10 100
2 20 200
3 30 300
julia> r[:,1]
3-element Array{Int64,1}:
1
2
3
```
how about this? ``` julia> a = [1,2,3,10,20,30,100,200,300]
julia> r = reshape(a,3,3)
3x3 Array{Int64,2}:
1 10 100
2 20 200
3 30 300
julia> r[:,1]
3-element Array{Int64,1}:
1
2
3
```