michaelmead wrote: "Can you do while loops in revit? If not, how do you track three variables? For example If 10<20, and 20<30, then C=1. the only problem is that C can have 4 values and logically can have more than one correct value based on the values of A and B...? any programers out there? Thanks!"
A while loop is not possible within Revit's... less than stellar formulaic abilities. You can use a series of nested IF/THEN/ELSE statements. For example, this formula defines the Integer Value of "ParamC" based on the values of "ParamA" and "ParamB":