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.




func writedat(filename, x, y, x_precision=3, y_precision=5) {
    var fh = File(filename).open_w
 
    for a,b in (x ~Z y) {
        fh.printf("%.*g\t%.*g\n", x_precision, a, y_precision, b)
    }
 
    fh.close
}
 
var x = [1, 2, 3, 1e11]
var y = x.map{.sqrt}
 
writedat('sqrt.dat', x, y)