**Get Grouped Sums Array**adds up groups of values from the input array and outputs the group sums as a new array. It can also do cumulative sums. If you're not working in a subcomponent context, you can also try this approach using GenerateSampleSet:

http://xsisupport.com/2014/02/27/ice-summing-up-array-elements-of-group/**INPUTS****---> Input Array**:

The input array that gets read from for the additions (allows per subcomponent, object contexts and as datatype: vector, scalar, integer, quat, color)**---> Group Size(s)**:

The number of elements in each "addition group". Can be an array.**---> Increment**:

Steps to take to find "next" group element to add. Usually 1 but other values can make sense, see examples.

**OUTPUT****---> Result Array**:

Output array of the sums of the individual groups. Get set to the same datatype and context as the Input Array.**EXAMPLES**// Example 1: groups of 4

Input Array: [2,3,0,5,0,1,2,3,1,5,5,5]

Group Size: 4

Increment: 1

Result: [2+3+0+5, 0+1+2+3, 1+5+5+5]

// Example 2: groups of 3, every 4th element

Input Array: [2,3,0,5,0,1,2,3,1,5,5,5]

Group Size: 3

Increment: 4

Result: [2+0+1, 3+1+5, 0+2+5, 5+3+5]

// Example 3: differently sized groups

Input Array: [2,3,0,5,0,1,2,3,1,5,5,5]

Group Size: [1,5,2,4]

Increment: 1

Result: [2, 3+0+5+0+1, 2+3, 1+5+5+5]

// Example 4: cumulative sum

Input Array: [2,3,0,5,0,1,2,3,1,5,5,5]

Group Size: [1,2,3,4,5,6,7,8,9,10,11,12]

Increment: 0

Result: [2,5,5,10,10,11,13,16,17,22,27,32]

**Get Grouped Products Array**Same for products of array entries... uses cross product for vectors

**Get Cumulative Sums Array**This one is a convenience node that does what is shown in example #4. It contructs the group sizes array based on the input array and output the cumulative sums array [A1, A1+A2, A1+A2+A3, A1+A2+....]

**Get Repetition Array**This is a simple compound that creates repetions of an array, number of repetions is configurable of course:

// Example #1:

Input Array: [2,3,0]

Nb Repetitions: 3

Repeat Full Array: True

Result: [2,3,0,2,3,0,2,3,0]

// Example #2:

Input Array: [2,3,0]

Nb Repetitions: 3

Repeat Full Array: False

Result: [2,2,2,3,3,3,0,0,0]

enjoy and please report any bugs/ideas!

-rr