Task

Write two equal-sized numerical arrays 'x' and 'y' to
a two-column text file named 'filename'.

The first column of the file contains values from an 'x'-array with a
given 'xprecision', the second -- values from 'y'-array with 'yprecision'.

For example, considering:

   x = {1, 2, 3, 1e11};
   y = {1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791}; 
                                                          /* sqrt(x) */
   xprecision = 3;
   yprecision = 5;

The file should look like:

   1    1
   2    1.4142
   3    1.7321
   1e+011   3.1623e+005

This task is intended as a subtask for Measure relative performance of sorting algorithms implementations.




[<EntryPoint>]
let main argv =
    let x = [ 1.; 2.; 3.; 1e11 ]
    let y = List.map System.Math.Sqrt x
 
    let xprecision = 3
    let yprecision = 5
 
    use file = System.IO.File.CreateText("float.dat")
    let line = sprintf "%.*g\t%.*g"
    List.iter2 (fun x y -> file.WriteLine (line xprecision x yprecision y)) x y
    0