--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/m-toolbox/classes/@matrix/minus.m	Wed Nov 23 19:22:13 2011 +0100
@@ -0,0 +1,105 @@
+% MINUS implements subtraction operator for ltpda model objects.
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+% DESCRIPTION: MINUS implements subtraction operator for two matrix objects.
+%
+% CALL:        obj = obj1-obj2
+%              obj = minus(obj1,obj2);
+%              obj = minus(obj1,obj2,obj3) == minus(minus(obj1,obj2),obj3)
+%
+% REMARK:      More than two inputs are handled with nested calls.
+%              (This doesn't work at the moment. Do we need this?)
+%
+% <a href="matlab:utils.helper.displayMethodInfo('matrix', 'minus')">Parameters Description</a>
+%
+% VERSION:     $Id: minus.m,v 1.8 2011/04/08 08:56:32 hewitson Exp $
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+function varargout = minus(varargin)
+  
+  callerIsMethod = utils.helper.callerIsMethod;
+  
+  % Check if this is a call for parameters
+  if utils.helper.isinfocall(varargin{:})
+    varargout{1} = getInfo(varargin{3});
+    return
+  end
+  
+  if nargout == 0
+    error('### Subtraction operator can not be used as a modifier.');
+  end
+  
+  op      = 'minus';
+  opname  = 'subtraction';
+  opsym   = '-';
+  infoObj = getInfo('None');
+  
+  % collect input variable names
+  in_names = cell(size(varargin));
+  for ii = 1:nargin,if ~isa(varargin{ii}, 'plist'), in_names{ii} = inputname(ii); end, end
+  
+  % Collect all plists
+  [pl, pl_invars, rest] = utils.helper.collect_objects(varargin(:), 'plist', in_names);
+  
+  % Combine default plist
+  pl = combine(pl, getDefaultPlist());
+   
+  mat = matrix.elementOp(callerIsMethod, op, opname, opsym, infoObj, pl, rest, in_names);
+  
+  %%%%%%%%%%   Prepare output   %%%%%%%%%%
+  if nargout == numel(mat)
+    for kk=1:numel(mat)
+      varargout{kk} = mat(kk);
+    end
+  else
+    varargout{1} = mat;
+  end  
+end
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%                               Local Functions                               %
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+% FUNCTION:    getInfo
+%
+% DESCRIPTION: Get Info Object
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+function ii = getInfo(varargin)
+  
+  if nargin == 1 && strcmpi(varargin{1}, 'None')
+    sets = {};
+    pls  = [];
+  else
+    sets = {'Default'};
+    pls  = getDefaultPlist;
+  end
+  % Build info object
+  ii = minfo(mfilename, 'matrix', 'ltpda', utils.const.categories.aop, '$Id: minus.m,v 1.8 2011/04/08 08:56:32 hewitson Exp $', sets, pls);
+  ii.setArgsmin(2);
+  ii.setModifier(false);
+end
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+% FUNCTION:    getDefaultPlist
+%
+% DESCRIPTION: Get Default Plist
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+function plout = getDefaultPlist()
+  persistent pl;  
+  if exist('pl', 'var')==0 || isempty(pl)
+    pl = buildplist();
+  end
+  plout = pl;  
+end
+
+function pl = buildplist()
+  pl = plist.EMPTY_PLIST;
+end