You seem to want to populate the arrays @a and @b with the data from your file. But you declare them within the loop over the lines of your file. So for every line you read you create new versions of these arrays and forget all information from previous lines. This is surely not what you want. To make your data persistent across the lines of your file, you need to declare common structures before you enter the loop. 

my @a;
my @b;
while (<FILE>)
{
  ...

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In reply to Re: use of uninitialized value by hdb
in thread use of uninitialized value by rocketperl

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