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    %% Find Bandwidth of Sparse Block Matrix  

%% 
% Create a 100-by-100 sparse block matrix. 
B = kron(speye(25),ones(4));  

%% 
% View a 10-by-10 section of elements from the top left of |B|. 
full(B(1:10,1:10)) 

%%
% |B| has 4-by-4 blocks of ones centered on the main diagonal.  

%% 
% Find both the lower and upper bandwidths of |B| by specifying two output
% arguments.
[lower,upper] = bandwidth(B)