I've currently plotted an array signal that displays x and F(x) (not in a continuous manner but in a discreet one as it's an array). The signal plot is shown below.
My question is if there is a way to find out the slope of a point in the plot or if you can somehow get a slope from two close points on the plot, so I can then calculate m (slope constant). I need this in order to find out the transfere function of the signal.
Thank you very much in advance.