Consider a discrete signal S sampled at point x={2,5,9,11}, whose respective values are S(x)={300,312,340,400}.
How would you calculate its power?
If it was an equi-sampled signal, with sampling period T=1, I would just calculate sum(S^2(i))/N with N=length(S(i)).
Intuitively, I would calculate the power over a non equi-sampled sequence with something like:
sum(S^2(x(i)))*(N-1)/(N*(x(N)-x(1)))
In the example: (300^2+312^2+340^2+400^2)*3/(4*(11-2))
But I am not sure this is a general result. Is there a well-known formula?