I ma looking for solution that will allow me to calculate a derative (in numerical way) from data from array.
I have an array caled DataOutput it's defined as:
DataOutput = zeros(length(phiAStart:phiAStep:phiAEnd),30);
are defined by a user (as input)
In this array, I have two columns that I would like to further work with. In column 1 I have "x" and in column 26 I have a "y"... where y=f(x) and x value is incremented by loop function:
Now what I would like to do is calculate a derivative and store it in another array (or even in the same if its possible). For calculation I would like to use simple formula:
For clarification this is how it's done in excel sheet:
I am assuming that I will need another for loop outside of the previous one but I am not sure how I should define a formula for this sort of equation (especially how to define new vectors).
I would be thankful for any idea.