I am not sure if I should use the join function to fix the problem I am having :) Sorry about the misleading title!

I just want to get the $ratio1 to be "join" back as tabs instead of breaking into new line.

The nested loop is to allow the division for row against row. So take the whole column and put as array. $arr_ref2(@full_data) and $arr_ref2(@full_data)

So that I can do : my $ratio1 = $$arr_ref2$index/$$arr_ref1$index;

I hope it is more clear now? - E :)