MATLAB: What is the correct formula of (sum of …from…to…) in matlab

correct formula

    snrin=(-5:5:55);                %initial snr
    N=length(ecg);                  % length of ecg signal 
    n=(0:N-1);
    e=sum (ecg^2) from 0 to N-1;    **% I want to write this formula correctly**
    f=sum (W^2) from 0 to N-1;      *% also this*
    A=sqrt(e/(10^(snrin/10))*f);    *% also this one*

Best Answer

e = sum( ecg(1+n).^2 );
f = sum( W(1+n).^2 );
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