Calculate value to procent

[Tokatubs]

Looks like the above function you posted is javascript... are you running this in the custom javascript scripting part of lm? 
if not and assuming you want lua try the below.

Code:

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function rangePercentage (input, range_min, range_max, range_2ndMax)    percentage = ((input - range_min) * 100) / (range_max - range_min)   if percentage > 100 then     if  range_2ndMax then      percentage = ((range_2ndMax - input) * 100) / (range_2ndMax - range_max)       if percentage < 0 then           percentage = 0          else           percentage = 100       end           end         else if percentage < 0 then         percentage = 0       end   end       return percentage       end log(rangePercentage (65, 46, 195, 195))

Just to clearify. I picked this script up site describing the calculation, so i was sure i was missing something
I am using this script to sum the Supply air vav. 

Code:

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function tag_sum(tag)   local objects, result   result = 0   objects = grp.tag(tag)   for _, object in ipairs(objects) do     result = result + object.data   end   return result end sum = tag_sum('Supply') grp.checkwrite('1/1/1', sum)

Since i only have one central extract vav. I then want to convert the supply sum to an control value 0-100 % to control the Extract vav.
Given that i know the Min/Max flow values of the Vav.
Been searching forum, but have not seen anything.