please explain the function of each command used in this code. These commands are part of allan variance code.

avar = zeros(numel(m), 1);

for i = 1:numel(m)

mi = m(i);

avar(i,:) = sum((theta(1+2*mi:L) - 2*theta(1+mi:L-mi) + theta(1:L-2*mi)).^2, 1);

end

avar = avar ./ (2*tau.^2 .* (L - 2*m));

adev = sqrt(avar);

Answer 1

[DGM]

zeros()

numel()

sum()

sqrt()

https://www.mathworks.com/help/matlab/matlab_prog/matlab-operators-and-special-characters.html

That should cover everything.

[Karishma Chawla]

hello, thank you for replying.

can you please let me know how the below command works

avar(i,:) = sum((theta(1+2*mi:L) - 2*theta(1+mi:L-mi) + theta(1:L-2*mi)).^2, 1);

[DGM]

It's the sum of the squares of three segments of the vector theta:

• a segment at the beginning
• plus a segment ending at L
• minus a segment centered between the two

The segments are all of length L-2*m(i), whatever that is.