in reply to Re^2: hash references
in thread hash references

No, @{$site1{$_}} is a "normal" array. Hopefully $site1{$_} is a reference to an array, otherwise you are in trouble (either you have "use strict" then this will give an error, without it you might get no error but it still won't work as you intent

What you probably want is something like $site1{$_}->[1]. This will access array index 1 of the array pointed to by $site{$_}

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Re^4: hash references
by Anonymous Monk on Aug 01, 2011 at 12:19 UTC

    i changed the code as follow,but still same error.:-(

         my $m=($genome1{$_}->[1]-$genome2{$_}->[1]);
     my $n=($genome1{$_}->[0]-$genome2{$_}->[0]);

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      That is because you have more than one bug in your code. As JavaFan pointed out your subroutine begins with

      my(%site1)=@_;
my(%site2)=@_;

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      which makes no sense as it will give you identical data in both variables. If you want to give two hashes to a subroutine you should use hash references instead, i.e.

      
sub x {
  my(%site1)= %{$_[0]};
  my(%site2)= %{$_[1]};
  ...
}

x(\%hash1,\%hash2);

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      Also, as moritz repeatedly pointed out, you seem to have strings where you expected array references, so your data is different. So another bug is in the code outside of this subroutine

      Please use Data::Dumper to check up on your data. For example add a line

        use Data::Dumper;
  print Dumper(\%site1);

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      to your subroutine (and similar prints at other places) and compare your data structure with what you expect.

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