Formular Cells
When we are talking about formula cell in sigma grid, we mean a well defined algebraic expression based on grid cells. This algebraic expression refers to some other cells' value. A cell containing a formula displays the result
Value in formular cell changes dynamically if the refered cells changes. In the sample above, edit bill cells(2005,2006,2007,2008) and input a new value to see what happens in bill average cell.