function gcusum( N, sum, x, strideX, offsetX, y, strideY, offsetY ) {
	return gcusumkbn( N, sum, x, strideX, offsetX, y, strideY, offsetY );
}
Computes the cumulative sum of strided array elements.

@param {PositiveInteger} N - number of indexed elements
@param {number} sum - initial sum
@param {NumericArray} x - input array
@param {integer} strideX - stride length for `x`
@param {NonNegativeInteger} offsetX - starting index for `x`
@param {NumericArray} y - output array
@param {integer} strideY - stride length for `y`
@param {NonNegativeInteger} offsetY - starting index for `y`
@returns {NumericArray} output array

@example
var x = [ 2.0, 1.0, 2.0, -2.0, -2.0, 2.0, 3.0, 4.0 ];
var y = [ 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ];

gcusum( 4, 0.0, x, 2, 1, y, 1, 0 );
// y => [ 1.0, -1.0, 1.0, 5.0, 0.0, 0.0, 0.0, 0.0 ]