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    %ISMATRIX True if input is a matrix.
%   ISMATRIX(M) returns logical 1 (true) if SIZE(M) returns [m n] 
%   with nonnegative integer values m and n, and logical 0 (false) otherwise.
%
%   See also ISSCALAR, ISVECTOR, ISROW, ISCOLUMN, ISNUMERIC, ISLOGICAL, ISCHAR, 
%            ISEMPTY, SIZE.

%   Copyright 2009-2010 The MathWorks, Inc.
%   Built-in function.