Store array in cells of DataFrame?

General Usage
1

I’m having trouble with the following behavior:

julia> df = DataFrame(a = Array[], b = Int[]); push!(df, [[1,2,3], 6])
1×2 DataFrame
│ Row │ a         │ b     │
│     │ Array     │ Int64 │
├─────┼───────────┼───────┤
│ 1   │ [1, 2, 3] │ 6     │

but then:

julia> df = Dict("a" => [1,2,3], "b" => 6) |> DataFrame
3×2 DataFrame
│ Row │ a     │ b     │
│     │ Int64 │ Int64 │
├─────┼───────┼───────┤
│ 1   │ 1     │ 6     │
│ 2   │ 2     │ 6     │
│ 3   │ 3     │ 6     │

how to make the second one work like the first?

2

It’s getting confused about what shapes you are trying to broadcast to, because the columns have different sizes (3 and 0). You should think of the Dict as the dataframe itself, that is a dict of columns.

This works

DataFrame(Dict("a"=>[[1,2,3]], "b"=>[6]))
2 Likes
3

ah… a classic [[]], should have though about this.