The SUM Aggregate Function

Currently, the RASON modeling language supports one aggregation statement which may be used to summarize a formula, the sum formula. Similar to for(), sum() is a statement that behaves not as a programming language loop, but rather as an attribute to its assigned formula. The sum() function computes a formula for a given set of indices.

sum(p in 'POT', g in 'GRADE'): {
   cost: { formula: "AMT[p, g] * Prem_Cost[g]"}
}

The formula for cost will be computed for each index and the sum of all resultant products will be calculated.

Note: The RASON language sum() statement described above should not be confused with the sum() function that may exist within a formula.

In this example code, AMT is an array, indexed by p and g and Prem_Cost is an array, indexed by g. If AMT[p,g] is a 2x2 matrix

1 1

2 2

and Prem_Cost[g] is a 2 x 1 vertical array

6

9

then PremiumCost will equal 45 (1 * 6 + 1 * 9 + 2 * 6 + 2 * 9).