A = zeros(104,15);
A(:,4) = 1; % Just to distinguish column 4 from column 7
A(:,7) = 101; % Just to distinguish column 4 from column 7
B = (1:103)'; % Define a 103x1 B matrix
C = zeros(size(B)); % Preallocate the new matrix so that we can use the "end" operator
% Odd values: 1:2:end means start at element 1, increment by 2, continue to the end of the array
% Even values: 2:2:end means start at element 2, increment by 2, continue to the end of the array
C(1:2:end) = A(1:2:length(B),4) + B(1:2:end); % Odd
C(2:2:end) = A(2:2:length(B),7) + B(2:2:end); % Even
