So are you supposed to only have 1 input then? And you are looking for when your input changes from positive to negative and visa versa?
There are only two ways to tell somebody thanks: Kudos and Marked Solutions Unofficial Forum Rules and Guidelines "Not that we are sufficient in ourselves to claim anything as coming from us, but our sufficiency is from God" - 2 Corinthians 3:5
-------------------------------------------------------------------------------------------------------- Kudos are always welcome if you got solution to some extent.
I need my difficulties because they are necessary to enjoy my success. --Ranjeet