How can I combine two vectors with different lenghts and indexes into one sum.

I have different power measurements in two clusters and one time scale (excess delay).

and I should compute RMS value according this formula

where Pi consists of sum of values from both clusters.

I cannot figure out way to start second vector (power values of cluster 2) from index 3. OR should I write IF conditions??

I would appreciate any help :)

Answer 1

[Askic V]

You obviously have missing values in your table. This is how I would approach to this problem:

tau = 0:10:80;
mu_tau = mean(tau);
Pc1 = [0,-5.4,-10.8,-16.2,-21.7,NaN,NaN,NaN,NaN];
Pc2 =[NaN,NaN,-3.2,-6.3,-9.4,-12.5,-15.6,-18.7,-21.8];

P = Pc1+Pc2;

RMS_val = sqrt(sum((tau-mu_tau).^2 .* P, 'omitmissing')/sum(P,'omitmissing'))

RMS_val = 10.7761

[Ruslan Askarov]

Sure, That's it! Thank you.