Topic: Array Calculation Question

I have two arrays that each contain values from a find_by_sql.   

@totals is the amount due, which has one value in it. 
@payments is an array with 0 or more values. 

What I am trying to do is display the total remaining. That is to say the value in @totals minus the sum of the values in @payments. 

I can get them to display separately using something like:

<% @payments.each do |payment| %> <%= payment["amount"] %> <% end %>

How can I subtract the sum of all values in @payments from the one value in @totals?
The best I've been able to produce is a memory location...

Last edited by Fienix (2011-09-17 21:01:32)

Re: Array Calculation Question

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Re: Array Calculation Question