according to the first snippet, $arrays is an array-ref, so you have to dereference it in the second snippet

foreach(@$arrays) {
    ...
}
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On a second note: you access the elements of @data via subscript, but the for-loop gives you access to the elements during the iteration in the variable $_:

push(@$arrays, [split(/ /, $_)]) for(@data);
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should be working better; and don't use $a as a variable name, as it has a special meaning.

regards,
tomte

---

Hlade's Law:

If you have a difficult task, give it to a lazy person --
they will find an easier way to do it.