plot the integral of an array

Okey, I've been stuck with this problem for a couple of days now so I'm just going to ask for help here.

I've got an array with `n' numbers f=[1,n]. I can plot this array and it gives me a nice graph. Now I want to integrate this graph. I'm not interested in the total area underneath the graph, but I want to plot the integral.

Analytically this means that I have a function (f), want to find it's integral and then plot the integral (F). The problem is that in this case I don't have the function, only a set of coordinates. I already know that the function f can be approached with an interpolation between the known points.

Thanks in advance.

Answer 1

[Patrik Ek]

Ok if it is not too important that the integral is completely correct I guess that "cumsum" would work. Otherwise, you may want to create an own trapz, simps, or whatever method you like, that returns each element. Remember that you can also use any runge kutta method for solving numerical intgrals.