Calculates the sum of the squares of the SourceChart values over the time period: Data^2 + Data^2 + Data^2....
Chart to calculate the maximum from
Lower bounds index into the SourceChart
Upper bounds index into the SourceChart
TimeStamp of the new value
Note that this function is a class procedure so it may be called even if the TRSCustomChartFunction is not instantiated.
The function can also be called by custom functions. For example, you could create a custom function that calls this function and then does something with the result