--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/m-toolbox/classes/@smodel/sum.m	Wed Nov 23 19:22:13 2011 +0100
@@ -0,0 +1,126 @@
+% SUM adds all the elements of smodel objects arrays.
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%
+% DESCRIPTION: SUM adds all the elements of smodel objects arrays.
+%
+% CALL:        obj = sum(mdl_mat)
+%              obj = mdl_mat.sum()
+%              obj = sum(mdl_mat, dim)              % Not yet implemented!
+%              obj = mdl_mat.sum(plist('dim', dim)) % Not yet implemented!
+%
+% <a href="matlab:utils.helper.displayMethodInfo('smodel', 'sum')">Parameters Description</a>
+%
+% VERSION:     $Id: sum.m,v 1.6 2011/04/08 08:56:30 hewitson Exp $
+%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+function out = sum(varargin)
+  
+  % Check if this is a call for parameters
+  if utils.helper.isinfocall(varargin{:})
+    out = getInfo(varargin{3});
+    return
+  end
+  
+  if nargout == 0
+    error('### sum cannot be used as a modifier. Please give an output variable.');
+  end
+  
+  % Collect input variable names
+  in_names = cell(size(varargin));
+  for ii = 1:nargin
+    in_names{ii} = inputname(ii);
+  end
+  
+  % Collect all smodels and plists
+  [as, smodel_invars, rest] = utils.helper.collect_objects(varargin(:), 'smodel', in_names);
+  [pl, pl_invars, rest]         = utils.helper.collect_objects(varargin(:), 'plist', in_names);
+  
+  % Combine plists
+  usepl = parse(pl, getDefaultPlist());
+  
+  % Check the model parameters
+  for jj = 1:numel(as)
+    for kk = 1:jj
+      if ~strcmp(as(kk).xvar, as(jj).xvar)
+        warning('### Two of the models have different X variables. Taking the first');
+      end
+      if ~isequal(as(kk).xvals, as(jj).xvals)
+        warning('### Two of the models have different X data. Taking the first');
+      end
+    end
+  end
+  
+  % Copy the object
+  out = copy(as(1), 1);
+  expression = ['(' as(1).expr.s ')'];
+  name = ['(' as(1).name ')'];
+  
+  for jj = 2:numel(as)
+    expression = [expression ' + (' as(jj).expr.s ')'];
+    name = [name ' + (' as(jj).name ')'];
+    out.params = [out.params as(jj).params];
+    out.values = [out.values as(jj).values];
+  end
+  
+  out.expr = msym(expression);
+  out.name = name;
+  
+  [out.params,ii,jj] = unique(out.params, 'first');
+  out.values = out.values(ii);
+  
+  if ~isequal(ii,jj)
+    warning('Some parameters were not unique. Parameters from the first model were taken.');
+  end
+  
+  % Add history
+  out.addHistory(getInfo('None'), usepl, {inputname(1)}, [as(:).hist]);
+  
+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, 'smodel', 'ltpda', utils.const.categories.op, '$Id: sum.m,v 1.6 2011/04/08 08:56:30 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('dim', []);
+end