3 Replies Latest reply: Oct 23, 2012 4:49 AM by annie.lovelace RSS

    Calculate the sum of an expression

      Hello,

       

      I have a question concerning a sum.

      I have two columns :

      The first column is the state (input/output)

      The second is a value.

       

      I want to make the sum of these values : when the value is an input I add the value to the sum and when the value is an output, I remove this value to the sum.

       

      I know that it is an expression in my graph, but I don't know how to do that......

       

      Thanks for your help

       

      Annie