my @matrix;
my $row = 0;

# count no. of lines 
open(DATA, "< data.txt");
my @lines = <DATA>;
close(DATA);
my $c = @lines;

open(DATA, "< data.txt");

push @{$matrix[$row++]}, split while <DATA>;
dd @matrix;




&colprint(\@matrix);


close(DATA);
my @arrayOfninth_col;
sub colprint
{
	my $matrix_ref = shift;
	for (1 .. $c)
	{
		print "$matrix_ref->[$c-1][9] \n";
                my $value = $matrix_ref->[$c-1][9];
                push @arrayOfninth_col , $value;


	}

   # process the array @arrayOfninth_col for indexes 
}