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    %% Create Character Vector from Values in Cell Array  
C = { 1,   2,   3 ;
     'AA','BB','CC'};

str = sprintf(' %d %s',C{:}) 

%%
% The syntax |C{:}| creates a comma-separated list of arrays that contain
% the contents of each cell from |C| in column order. For example, |C{1}==1|
% and |C{2}=='AA'|.