Passing a seq from F# to RProvider

Question

I want to be able to pass a sequence of option float to the RProvider in F#. If I have a sequence of floats with Some float and Non

Answer 1

I think you should be able to do this just be replacing the None values with nan (this is not entirely right, because in R NA and NaN are different, but there is no way to express two different non-values for a float in F#):

let optData4 = 
    [ 10.0; 9.0; 8.0; nan; 6.0; 5.0; 5.0; nan; 4.0; 2.0; nan ]

let testData4 = 
    namedParams [
        "regPrice", optData4;]
    |> R.data_frame

I have not tested this, but I think this is what we do in Deedle internally.

Answer 2

You can do it with Deedle and nullable values:

let toNullable =
       function
       | None -> Nullable()
       | Some x -> Nullable(x)

let optData4 = 
    seq [Some 10.0; Some 9.0; Some 8.0; None; Some 6.0; 
        Some 5.0; Some 5.0; None; Some 4.0; Some 2.0; 
        None] 
    |> Seq.map(toNullable)

let series = Series.ofNullables(optData4)

let testData4 = 
    namedParams [
        "regPrice", series;]
    |> R.data_frame