The SUM Function

The SUM function produces the sum of repetitive terms.  The form is:

value = SUM( name, initial, final, expression )

The expression argument is evaluated and summed for name = 0,1,2,...final.

For example, the statement:

source = SUM(i,1,10,exp(-i))

forms the sum of the exponentials exp(-1)+exp(-2)+...+exp(-10).

The SUM function may be used with data ARRAYs, as in

DEFINITIONS

   A = ARRAY(1,2,3,4,5,6,7,8,9,10)

   source = SUM(i,1,10,A[i])

Example:

Samples | Misc | Sum.pde