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rf#type-providers

F# R type provider and cbind

I'd like to visualize data with matplot but initially I need to combine them through R.cbind.

I have two quantiles arrays quantiles1 and quantiles2 like this

val it : double [] =
  [|9.493529797e-05; 0.00356456441; 0.006148920477; 0.01201379844;
    0.04056193231; 0.1144207457; 0.3402441047; 0.7572200933; 1.432890804;
    2.755986279|]

When I call 

R.cbind(quantiles1, quantiles2)

the result is 

val it : SymbolicExpression =
                 ...
 [1,] 0.0000949353
 [2,] 0.0035645644
 [3,] 0.0061489205
 [4,] 0.0120137984
 [5,] 0.0405619323
 [6,] 0.1144207457
 [7,] 0.3402441047
 [8,] 0.7572200933
 [9,] 1.4328908043
[10,] 2.7559862789

But I'd expect two columns here. What is the way how I should use get correct result withcbind in F# type provider?

Solution

  • This should work for you:

    let x12 = R.cbind(namedParams ["x1", box x1; "x2", box x2])
R.dim(x12)
// val it : SymbolicExpression = [1] 10  2

    The reason is that R.cbind expects the following type: enter image description here

    Edit You can make a helper function if it gets too tedious....

    let makeRParams (xs:#seq<_>) =
    xs
    |> Seq.mapi (fun i x -> ("x"+i.ToString(),box x))
    |> dict