When you say $new_hash{$some_key1} = @some_array1; you are assigning to a scalar. Try 
@{$new_hash{$some_key1}} = @some_array1; # extra {} are for clarity

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Of course, you will need to change the @value_array assignement: 

  my @value_array = @{$new_hash{$_}};

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In reply to Re: How to assign an array to a value in hash? by matija
in thread How to assign an array to a value in hash? by shilpam

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