MATLAB: If a matrix contains 1’s and 0’s ,i would like to get only those 1’s and want to take avg values of those corresponding intensity values

Question

If a matrix contains 1's and 0's ,i would like to get only those 1's and want to take avg values of those corresponding intensity values

Answer 1

Let a be your vector which have 0 and 1.

% get indices of 1 
idx = a(a==1);

Let b be your intensity values corresponding to a.

% extract inentisity values of positions 1 
b_1 = b(idx);