Who can help.
To transform a vector into a one-dimensional matrix just run in Julia:
a = copy(permutedims([1,2,3]))
To transform the matrix "a" into a vector just use:
b = copy(vec(a))
If you have a matrix "[1 2 3; 4 5 6]" to transform it into a vector, just:
c = vec([1 2 3; 4 5 6])
Now how to make the vector have the form of the 2x3 matrix like:
2×3 Matrix{Int64}:
1 2 3
4 5 6
You can use reshape
julia> c = vec([1 2 3; 4 5 6])
6-element Vector{Int64}:
1
4
2
5
3
6
julia> M=reshape(c,2,3)
2×3 Matrix{Int64}:
1 2 3
4 5 6
Note that this operation does not reallocate memory, c and M share the same memory. By example:
julia> c[1]=10
10
julia> M
2×3 Matrix{Int64}:
10 2 3
4 5 6