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.




use autodie;
 
sub writedat {
    my ($filename, $x, $y, $xprecision, $yprecision) = @_;
 
    open my $fh, ">", $filename;
 
    for my $i (0 .. $#$x) {
        printf $fh "%.*g\t%.*g\n", $xprecision||3, $x->[$i], $yprecision||5, $y->[$i];
    }
 
    close $fh;
}
 
my @x = (1, 2, 3, 1e11);
my @y = map sqrt, @x;
 
writedat("sqrt.dat", \@x, \@y);