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.




import "io" for File
import "/fmt" for Fmt
 
var x = [1, 2, 3, 1e11]
var y = [1, 1.4142135623730951, 1.7320508075688772, 316227.76601683791]
var xprec = 3 - 1 
var yprec = 5 - 1
File.create("filename.txt") { |file|
    for (i in 0...x.count) {
        var f = (i < x.count-1) ? "h" : "e"
        var s  = Fmt.swrite("$0.%(xprec)%(f)\t$0.%(yprec)%(f)\n", x[i], y[i])
        file.writeBytes(s)
    }
}