array0: first cell area
array1: second cell area
SUMXMY2 function returns the sum of the squares of the differences of corresponding values in two arrays. The equation of SUMXMY2 is SUM((x-y)^2).
If array0 and array1 have different number of data points, SUMXMY2 returns #N/A.
Strings and empty cells are simply ignored.
This function is Excel compatible.