Author Topic: Help with formula  (Read 698 times)


  • Newbie
  • *
  • Posts: 1
    • View Profile
Help with formula
« on: December 20, 2014, 11:19:19 AM »

I have problem with my new overall score formula. It works but the program said that it have an error?

My formula: sum(scores)*(1/sqrt(count(scores)))

Can anybody spot the problem?


Corey Cooper

  • Administrator
  • Hero Member
  • *****
  • Posts: 5575
    • View Profile
Re: Help with formula
« Reply #1 on: December 23, 2014, 09:22:09 PM »
Hi Peter.  Sorry for the delay in responding.  Holidays and all.

So, you can have a perfectly valid formula give an error when evaluated in the Formula dialog if the input values cause it to try to compute an invalid value.  For example, if your formula evaluates to some number divided by zero, you'll get an error.  So even though the formula may be valid, the value it's trying to compute isn't.

For your formula sum(scores)*(1/sqrt(count(scores))), if you don't enter values for the scores variable, then count(scores) evaluates to 0, and the square root of 0 is 0, and thus you end up with 1 divided by 0, which will give an error.  Try filling in some values for the scores variable and see if you get a different result.