The function will return:
- The price change from the start to the end of the period
- The price change from the start of the period to the highest point within the period
- The price change from the start of the period to the lowest point within the period
It was originally intended to be used in conjunction with other scripts to assist with decision making. However, it doesn't look too bad as an indicator and so plots have been added.
For more information regarding the code, some commentary and free tutorials, you can visit the Bactest-Rookies (.com) website.
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.