Hi, I have a vector that has 100 rows and two columns. I want to select the second column. Julia gives an error with the following command. Can anyone help me?

box=[0,1,0,1]

ninit= 100

pdp = [LinRange(box[1],box[2],ninit),box[3].+1e-4.*rand(ninit,1)]

pdp_end = ninit

tmp = pdp[1:pdp_end,2]

you don’t:

```
julia> pdp = [LinRange(box[1],box[2],ninit),box[3].+1e-4.*rand(ninit,1)]
2-element Vector{AbstractArray{Float64}}:
range(0.0, stop=1.0, length=100)
[6.5964924515518e-5; 4.554730444196513e-5; … ; 7.90834654968606e-5; 6.505428036713388e-5;;]
```

you have a vector of two elements, each element is `<: AbstractArray`

, one of them is a Range, the other one is a `100x1`

Matrix.

you probably wanted:

```
julia> [LinRange(box[1],box[2],ninit);; box[3].+1e-4.*rand(ninit,1)]
100×2 Matrix{Float64}:
0.0 2.98283e-5
0.010101 1.1944e-5
0.020202 2.74975e-5
...
..
.
```

Thank you for your answer. This command gives me a vector with 200 rows and a column. I want a matrix with 100 rows and 2 columns.

Previous solution works in Julia 1.7 or later. You can simply replace the comma `,`

separating the two vectors in your original `pdp`

assignment, by ` `

space.

Thanks for your answer. My problem was solved