Can we move above function to backend from frontend chart

[#1]

Hi All, Can we bring above function from front end to backend.Suppose i am having an expression  :if(Monthnumber=2,Salevalue,Salevalue-above(salevalue)).I have a perfect star schema and 12-13 dimension to apply filter in front end.Now i want to calculate this expression at backend including this above function's functionality with the similiar condition.                                                                          Regards, Dushyant

[gussfish]

Have you tried the script's Previous(...) function?