ViewHelper Documentation
v:math.sum
Math: Sum
Performs sum of $a and $b. A can be an array and $b a number, in which case each member of $a gets summed with $b. If $a is an array and $b is not provided then array_sum is used to return a single numeric value. If both $a and $b are arrays, each member of $a is summed against the corresponding member in $b compared using index.
Arguments
a anySimpleType
First number for calculation
fail boolean
If TRUE, throws an Exception if argument "a" is not specified and no child content or inline argument is found. Usually okay to use a NULL value (as integer zero).
b anySimpleType
Optional: Second number or Iterator/Traversable/Array for calculation