christopherh@1: %
christopherh@1: % INTERVAL2RCCLASS convert an interval to relative pitchclass displacement
christopherh@1: % 
christopherh@1: % [rcclass,success, errormessage] = interval2rcclass(interval, {verbose})
christopherh@1: % 
christopherh@1: % Converts an interval string to relative pitchclass displacement.
christopherh@1: %
christopherh@1: % Success = 1 if symbols parsed correctly, 0 otherwise. 
christopherh@1: %
christopherh@1: % If optional argument 'verbose' is 1, function prints any errormessage to 
christopherh@1: % the screen.
christopherh@1: % 
christopherh@1: % calls:    parseinterval
christopherh@1: %           degree2semitone
christopherh@1: % 
christopherh@1: % returns:  rcclass (integer)
christopherh@1: %           success  (boolean)  
christopherh@1: %           errormessage (string)
christopherh@1: %
christopherh@1: %
christopherh@1: % Author: Christopher Harte,  January 2010
christopherh@1: % 
christopherh@1: % Copyright: Centre for Digital Music, Queen Mary University of London 2005 
christopherh@1: %
christopherh@1: % This file is part of the C4DM Chord Toolkit V2.0  
christopherh@1: %
christopherh@1: % The C4DM Chord Toolkit is free software; you can redistribute it and/or 
christopherh@1: % modify it under the terms of the GNU General Public License as published 
christopherh@1: % by the Free Software Foundation; either version 2 of the License, or
christopherh@1: % (at your option) any later version.
christopherh@1: %
christopherh@1: % The C4DM Chord Toolkit is distributed in the hope that it will be useful,
christopherh@1: % but WITHOUT ANY WARRANTY; without even the implied warranty of
christopherh@1: % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
christopherh@1: % GNU General Public License for more details.
christopherh@1: %
christopherh@1: % You should have received a copy of the GNU General Public License
christopherh@1: % along with the C4DM Toolkit; if not, write to the Free Software
christopherh@1: % Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
christopherh@1: 
christopherh@1: %		
christopherh@1: function  [rcclass, success, errormessage] = interval2rcclass(interval, verbose)
christopherh@1:     
christopherh@1: if nargin <2 
christopherh@1:     % verbose defaults 0
christopherh@1:     verbose = 0;
christopherh@1: end
christopherh@1: 
christopherh@1: errormessage = '';
christopherh@1: 
christopherh@1: ilength = length(interval);
christopherh@1: 
christopherh@1: success=0;
christopherh@1: semitone = 0;
christopherh@1: 
christopherh@1: % parse the interval string
christopherh@1: 
christopherh@1: [degree, accidentals, present, ok,errormessage] = parseinterval(interval);
christopherh@1: 
christopherh@1: if (ok == 1)
christopherh@1:     
christopherh@1:     % convert degree and accidentals to equivalent number of semitones 
christopherh@1:     [semitone, ok, errors] = degree2semitone(degree,accidentals);
christopherh@1:     
christopherh@1:     rcclass = mod(semitone,12);
christopherh@1:     
christopherh@1:     
christopherh@1:     success = 1;
christopherh@1:     
christopherh@1: else
christopherh@1:     
christopherh@1:     errormessage = sprintf([errormessage 'Error in interval2rcclass: incorrect interval "' interval '"\n']);
christopherh@1: 
christopherh@1: end
christopherh@1: 
christopherh@1: if (verbose ==1) && (success ==0)
christopherh@1:     fprintf(1,errormessage); 
christopherh@1: end
christopherh@1: