Help needed with a Trend Strength Indicator

Hello,

I'm attempting to write an MT4 indicator based on a trend strength formula found on a website. The formula is for calculating a Trend Strength Index. It looks like it has some potential in spotting fast moving price within a short move.

The problem is in my handling of the arrays and functions. The formula and a nice explanation about the indicator can be found here...
http://www.nonrandomwalk.com/Blog/tsi.html

I can get it to work when it runs live or on the tester but I can't figure out how to get it to work on past bars. When I drop it on a chart it produces a flat line for the past bars.

This is my first attempt at an indicator and my goal was to learn Arrays and Functions. I tried and read everything I could find, any help would be greatly Appreciated.

Thanks,
Gary

The Slow100() must be calculated at the point in the past where the loop is currently is.

It should be:


Then in the Slow100() function:

FerruFX, thank you for the fast response, unfortunately the line is still flat but moved back 100 bars.

Do I need to do this for the other two functions?

Yes of course. Each function() in a loop must be run from where the main loop is ... Example when the main loop calculation is on the bar 100 (i==100), if your functions inside this loop are all calculated from candle 0, you will get always the same value. They must take the "i" as their starting point.

The light bulb went off. I'm taking a 10 day ATR avg., store it in a buffer, then move back a bar and repeat. This needs to step with the main buffer's "i".

Thanks for the help and especially thanks for sharing your FFx_Universal_Strength_Meter, excellent tool.

I'll post the indicator when it's working.

Good Trading