Indicator(s) based on user defined symbol

[Harapa]

Hi,
I am new to TOS, so bear with me.
How to plot predefined indicators using a user defined symbol in the indicator panel?
For example plotting ROC and its smoothing (moving average) of VIX, VXN, VXX on a plot of SPY price.
Thanks

 

[BenTen]

Take a look at the code from this post https://usethinkscript.com/threads/vold-divergence-indicator-for-thinkorswim.936/

You can use that as an example.

 

[Harapa]

Thanks. This should help me to get started.