Custom moving average indicator

[subterfuge]

Hi,

I have a feeling that my idea has already been done on here, so i'm hoping someone

can link me too it (assuming i'm correct)

I want a moving average indicator where I choose what bar the the indicator begins from.

So, if I was to take todays' CL chart, and decide I wanted my ema to begin from, 3pm, or 84 bars away, it

would look something like this:

cheers