Thanks for responding Nicolas but no, I do mean an actual derivative of a curve.
for example, the funktion x squared har the derivative 2x and the second derivative 2.
Another simpler question, I can’t find the answer in the manual..
Say it is now 14:30 in the afternoon.
average [20] (close) is yesterdays close value on mean20.
average [20] (open) is todays open value on mean20.
What is the syntax for the close of yesterday and the close three days ago?
Again, thanks for your help!