# Adding 1d array into 1d array (or Vector?) in mutable structs
**URL:** https://discourse.julialang.org/t/adding-1d-array-into-1d-array-or-vector-in-mutable-structs/94727
**Category:** New to Julia
**Tags:** question
**Created:** [February 16, 2023, 3:18pm UTC](https://discourse.julialang.org/t/adding-1d-array-into-1d-array-or-vector-in-mutable-structs/94727 "2023-02-16T15:18:48Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@rolim.gustavo](https://discourse.julialang.org/u/rolim.gustavo)
#### Post date: [February 16, 2023, 3:18pm UTC](https://discourse.julialang.org/t/adding-1d-array-into-1d-array-or-vector-in-mutable-structs/94727/1 "2023-02-16T15:18:48Z")
Hello everyone! I’m an industrial engineer and relatively new to Julia, so I’m sorry for any possible conceptual mistakes here.
I am interested in creating a vector containing multiple 1d arrays within a mutable structure called “Cell” like the following:
```julia
mutable struct Cell
Mat::Float16
IM::Float16
Bmut::Float16
Fit::Float16
OF::Int32
Sol::Vector{Int16} # This vector should contain multiple 1d arrays
Cell() = new(0.0, rand(Float16), rand(Float16), 0.0, 0, Vector{Int16}[])
end
```
I can properly initialize Cell with a variable called POP:
```julia
POP = Cell()
```
However, I cannot add elements (1d arrays) using push! into POP.Sol, i.e.:
```julia
K = Vector{Int16}[[1, 2, 3], [4, 5, 6]]
for i in 1:2
push!(POP.Sol, K[i])
end
```
The following error message appears: “LoadError: MethodError: Cannot `convert` an object of type Vector{Int16} to an object of type Int16”. In contrast, doing this is totally fine:
```julia
Z = Vector{Int16}[]
for i in 1:2
push!(Z, K[i])
end
```
Could anyone tell me how could I add the elements of K into POP.Sol such that POP.Sol = [[1, 2, 3], [4, 5, 6]]?
Best wishes!
---
### Author:  [@Oscar\_Smith](https://discourse.julialang.org/u/Oscar_Smith)
#### Post date: [February 16, 2023, 3:27pm UTC](https://discourse.julialang.org/t/adding-1d-array-into-1d-array-or-vector-in-mutable-structs/94727/2 "2023-02-16T15:27:56Z")
You want `Sol::Vector{Vector{Int16}}`
---
### Author:  [@rolim.gustavo](https://discourse.julialang.org/u/rolim.gustavo)
#### Post date: [February 16, 2023, 3:50pm UTC](https://discourse.julialang.org/t/adding-1d-array-into-1d-array-or-vector-in-mutable-structs/94727/3 "2023-02-16T15:50:06Z")
Thanks Oscar!