ischar.m

这是MATLAB小型的。下下去看看嘛

%ISCHAR  True for character array (string).
%   ISCHAR(S) returns 1 if S is a character array and 0 otherwise.
%
%   See also CHAR, ISNUMERIC, ISLOGICAL, ISOBJECT, ISJAVA.

%   Copyright 1984-2002 The MathWorks, Inc. 
%   $Revision: 1.8 $  $Date: 2002/04/09 00:33:34 $
%   Built-in function.