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If I change:
my $quant = $tree_collection{$years}{$trees}{$size} || "-" +;
my $quant = $tree_collection{$years}{$trees}{$size} || 0;
One group of your warning messages goes away:
Argument "-" isn't numeric in addition (+)
You must decide if this still gives you the output you need.

In reply to Re: Creating Reports with hashes: Use of uninitialized value while adding integers by toolic
in thread Creating Reports with hashes: Use of uninitialized value while adding integers by GertMT

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