comparison chordtools/interval2rcclass.m @ 1:8973548174c1 tip

adding tools to repo

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