Help for this page
my $i = 0; (chomp $_->[1], $_->[2] = $i++) for @multi_array;
print join(",", @{$_}),"\n" for (@multi_array); 4.20064619e-03, 5.30384531e+04,91 4.24680719e-03, 5.28570000e+04,92 ...