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    %% Cumulative Sum of Each Row in Matrix  

%% 
% Define a 2-by-3 matrix whose elements correspond to their linear indices. 
A = [1 3 5; 2 4 6]  

%% 
% Find the cumulative sum of the rows of |A|. The element |B(3)| is the sum
% of |A(1)| and |A(3)|, while |B(5)| is the sum of |A(1)|, |A(3)|, and
% |A(5)|.
B = cumsum(A,2)