[amibroker] slope of an indicator eg moving average

["doedau" <don.edwards@xxxxxxxxxxxxxx>]

Firstly, thanks to those who helped on my average over vol histogram 
problem - what a great group of people here.

Now I want to plot a moving average (which even I can do) then also 
somehow measure/plot the slope of that line ie up, flat, down and 
preferably a number that relates to the degree of slope. I think the 
Tan function would do it, but it involves radians and so far I cant 
get it to work. Anyone tackled this before or have the math to help me 
work it out?
Thanks in advance - Don.