I want the highest high of the visible bars using something like Highest(high, length) where length is the number of visible bars.

From the CompoundValue() function, I think ThinkOrSwim knows the number, I just need access to it.

 

Code

CompoundValue ( int length, IDataHolder visible data, IDataHolder historical data ) visible data = Defines data to be returned if bar number exceeds the specified length

Thanks for any tips.

Plot ha = highestall(high); plots highest high of all bars loaded on your chart.

Plot hi = Highest(high[1], 10); plots the highest high within the last 10 closed bars.