Let's suppose I've got an array that has values 100,200,300,400. What could I do w/ matrix formulas to implicitly construct a 4x4 matrix that looks like: 1,2,3,4 0,1,2,3 0,0,1,2 0,0,0,1 The above is just a wedge that has each row "lagged" from the previous. I can do it explicitly by creating the lag matrix w/ lookup functions right on the sheet, but curious if I might be able to do it right in the formulas. That way I'd avoid the burden of creating lots of utility calculation areas in the workbook. (Aside - use case: These matrices are instrumental to modeling cumul...