in reply to declare my variable in loop

The @Array_Vals goes out of scope as (each iteration of) the loop ends. If you use strict (and you always should - especially while learning) then that code won't even compile.

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Re^2: declare my variable in loop
by gauss76 (Scribe) on Aug 08, 2017 at 08:33 UTC

    Apologies, the last curly bracket was in the wrong place. It should have been:

    my @Array_of_ALL_Vals;
for my $iloop (0 .. 10){
    my @Array_Vals;
    .
    Code in here to populate @Array_of_Vals
    .
    push @Array_of_ALL_Vals,\@Array_Vals;
}

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      With your code, the my declaration will create a fresh @Array_Vals every trip around the loop.

      If you want to see your data structure, use Data::Dumper to show it:

      my @Array_of_ALL_Vals;
for my $iloop (0 .. 10){
    my @Array_Vals;
    .
    Code in here to populate @Array_of_Vals
    .
    push @Array_of_ALL_Vals,\@Array_Vals;

    print Dumper \@Array_of_ALL_Vals;
}

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        OK thanks, that I understand, however on creation of the new @Array_Vals and subsequent inclusion into the @Array_of_ALL_Vals array will that mess up any of the previous values already present in the @Array_of_ALL_Vals array which would already contain the address of another instance of the @Array_Vals array which has now been overwritten.

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      ... the last curly bracket was in the wrong place. It should have been ...

      It's possible and preferable for you to correct your OP — with a note to explain that a correction had been made; see How do I change/delete my post? See the Edit link in the upper right corner of your OP or in the lower right set of links in one of your replies.

      Give a man a fish:  <%-{-{-{-<

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