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Something like this?

>> h  ash.new( [] )
{}
>> h["a"] << 2.2
[2.2]
>> h["a"] << 3
[2.2, 3]
>> sum_of_a  .0
0.0
>> h["a"].inject { |sum_of_a, value| sum_of_a + alue }
5.2
>> sum_of_a
5.2

I have no idea if that's the best way to do that; I'm still earning my Ruby
chops.

Regards,
Craig

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