How do I calculate the RMS of every 5 values?

Hello, I have a vector of 66000 values and I would like to know the root mean square (RMS) of every 5 values. Do I need a loop for this? Or is there some easier way to solve this?

Thanks in advance! Shawn

Answer 1

[Guillaume]

If you mean you want the RMS of the first 5 values, followed by the RMS of the next 5 values, etc., then assuming your vector length is a multiple of 5 simply reshape it into columns of 5 elements:

rms = sqrt(mean(reshape(yourvector, 5, []) .^ 2));

If you mean you want a moving rms (rms of elements 1-5, rms of elements 2-6, etc.), then use movmean:

movrms = sqrt(movmean(yourvector .^ 2, 5));

[Shawn Imming]

I meant the first one. But thanks this works great!

[Sneha Kothapally]

Hello Guillaume,

I have a Question similar to the one above.

Q.Calculate moving root meaning square with every 100 data points or so-called time window. All the moving time windows are not overlapped for simplification. Also, a new time vector needs to be calculated to synchronize the moving RMS data.(EMG)

Can I Use ,

RMS = movingRMS(LowFilt_EMG,100);

rmsTime = newTime(Time,100);

Actually I tried using these codes. but it was showing the error. Can you please help me with this?

[Julien Rodriguez]

Thank you very much Guillaume.

Have a nice year ¿??¿

[Julien Rodriguez]

Really Guillaume I don't know how to thank you properly.

You should be in the Avengers cause you're my little hero.

    plot(love);

[krishna teja]

awesome piece of code, Guillaume !!! have a great year

reduced my code execution from 1 sec to 0.025 sec !!