Concatenation of arrays in Julia can be done using the vcat() and hcat() functions.
vcat() function concatenates two arrays vertically and creates a new array. In other words, it stacks one array on top of the other.
Example:
a = [1 2 3]
b = [4 5 6]
c = vcat(a, b)
Output:
3×3 Array{Int64,2}:
1 2 3
4 5 6
hcat() function concatenates two arrays horizontally and creates a new array. In other words, it stacks one array next to the other.
Example:
a = [1 2 3]
b = [4 5 6]
c = hcat(a, b)
Output:
1×6 Array{Int64,2}:
1 2 3 4 5 6
Note that both vcat() and hcat() functions require that the dimensions of the arrays to be concatenated are compatible.