Subtracting 2 values from different collections using and el

[Adam Bickford]

In a nutshell, I want to iterate over a collection and subtract a value 
from a different collection with the same position as the current 
collection.  The problem is, I don't know how to reference the current 
iterator.

For example, how would I do something like this:

       int[] a =  {0,1,2,3,4,5,6,7,8,9};
       int[] b =  {9,8,7,6,5,4,3,2,1,0};
       for(int i = 0; i < a.length; i++){
           System.out.println(b[i]-a[i]);
       }
How could I achieve that in JSTL using el?
   <c:forEach var="total" items="${dailyTotals}">
         <td>
                 <c:out value="${total-(value in another collection 
with the same index as this loop)}"/>
         </td>
   </c:forEach>



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