Several problems here. Use warnings and strict!
Your error is because you are calling 'sorter' on line 26 with only one argument - you are not passing it an '$iter'.
It is a bad idea to have a local variable and a global of the same name - very confusing ($iter).
The syntax for calling the ref should be &$iter($index)
I also spotted that your foreach loop is wrong, use $#lines for the highest index, @lines will go one element beyond the end of the array (it give s the number of elements).
Probably more errors lurking, but that should do for now.
update: $allSeq[&$iter()]= $allSeq[$index].$first;I really hate your use of globals in the subroutine, sorry, but it makes the code difficult to figure out. Should your $first and $second in sorter() overwrite the globals?

In reply to Re^3: using reference to subroutine by cdarke
in thread using reference to subroutine by kotoko

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