use strict;
use warnings;
use 5.010;

my $str = "0\t" x 10;
my @values = split '\s+', $str;

printf "First statement:\t%s\n", join "\t", @values;

@values[2, 3] = (0.5, 0.845);
printf "Second statement:\t%s\n", join "\t", @values;

##</code><code>##

First statement:	0	0	0	0	0	0	0	0	0	0
Second statement:	0	0	0.5	0.845	0	0	0	0	0	0