%ISLETTER True for letters of the alphabet
%   For a character vector or string scalar CHR, ISLETTER(CHR) is 1 for 
%   letters of the alphabet and 0 otherwise.  This is equivalent to 
%   ISSTRPROP(CHR,'alpha').
%   See also ISCHAR, ISSPACE, ISSTRPROP.

%   Copyright 1984-2017 The MathWorks, Inc.

%   Built-in function.

