%ISLETTER True for letters of the alphabet.
%   For a string S, ISLETTER(S) is 1 for letters of the alphabet
%   and 0 otherwise.
%
%   Character sets supported:
%      Mac  : Standard Roman
%      PC   : Windows Latin-1
%      Other: ISO Latin-1 (ISO 8859-1)
%
%   See also ISSPACE.

%   Copyright (c) 1984-98 by The MathWorks, Inc.
%   $Revision: 5.5 $  $Date: 1997/11/21 23:47:21 $


%   Built-in function.
