The real author:
Richard Dawood Donchyan
Donchian Channel is a volatility indicator based on the calculation of the current price range with the recent highest and lowest prices.
Code is similar to Donchian Channels, but the middle line is not plotted.
Donchian Channel indicator
This indicator is useful for correlation analysis and also for cross pair analysis.iBarShift
There are a lot of users who searched for iBarShift function like in MQL4. But this function is no more include in MQL5, mainly because MQL5 provides all necessary basic, low-level, functions to process such thing in a library.