diff chordtools/chord2fifthpositions.m @ 1:8973548174c1 tip

adding tools to repo

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/chordtools/chord2fifthpositions.m	Mon May 06 14:43:47 2013 +0100
@@ -0,0 +1,82 @@
+%
+%CHORD2FIFTHPOSITIONS Convert chord symbol to pitch positions on line of fifths
+% 
+% [fifthpostions, bass, success, errormessage] = chord2fifthpostions(chordsymbol, {verbose})
+% 
+% Converts a chord symbol to an array of integer positions on the line of fifths.
+% C is the reference position 0.
+%
+% In the case of the 'no chord' symbol 'N' function returns an empty array
+%
+% Success = 1 if notes extracted from chordsymbol correctly, 0 otherwise.
+% 
+% If optional argument 'verbose' is 1, function prints any errormessage to 
+% the screen.
+% 
+% calls:    chord2notes
+%           notes2fifthpositions
+% 
+% returns:  fifthpostions (array of integers)           
+%           success (boolean)
+%           errormessage (string)
+%
+%
+% Author: Christopher Harte,  March 2009
+% 
+% 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 [fifthpostions, bass, success, errormessage] = chord2fifthpostions(chordsymbol, verbose)
+
+% set verbose default to 0
+if nargin < 2
+    verbose = 0;
+end
+
+errormessage = '';
+mainlist = '';
+success = 1;
+fifthpostions = [];
+bass = '';
+
+% get constituent notes
+[chordnotes, bassnote, success, errormessage] = chord2notes(chordsymbol);
+
+if success && ~isempty(chordnotes)
+% find fifthpostions of notes
+[fifthpostions, success, errormessage] = notes2fifthpositions(chordnotes);
+end
+
+if success && ~isempty(bassnote)
+[bass, success, errormessage] = note2fifthposition(char(bassnote));
+end
+
+
+
+if success == 0
+    errormessage = [errormessage sprintf(['Error in chord2fifthpostions: Couldn''t convert chord "' chordsymbol '"\n'])];   
+    if verbose ==1
+       fprintf(1,errormessage);
+    end
+       
+       
+end  
+    
+    
+    
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