I have been searching the info and web site for how to perform a 'calcuate difference' function on a single column (channel) of data. For example if my channel data is a time period of say the following: 100, 101, 99, 102, 100, 99... I would like to calculate 100-101 then 101-99 then 99-102 and so on for all values. How do I perform this?