--- a/+rv/+time/RungekuttaExteriorRV.m	Mon Jan 07 16:41:21 2019 +0100
+++ b/+rv/+time/RungekuttaExteriorRV.m	Fri Jan 11 15:47:10 2019 +0100
@@ -24,8 +24,7 @@
     end
     methods
 
-        % TODO: Decide on how to compute dvdt.
-        function obj = RungekuttaExteriorRV(F, k, t0, v0, RV, DvDt, rkOrder, bdfOrders)
+        function obj = RungekuttaExteriorRV(F, k, t0, v0, RV, DvDt, rkOrder)
             obj.F = F;
             obj.k = k;
             obj.t = t0;
@@ -37,23 +36,6 @@
             obj.coeffs = struct('s',s,'a',a,'b',b,'c',c);
         
             obj.RV = RV;
-            %  TBD: Decide on if the initialization of the previous stages used by
-            %       the BDF should be done here, or if it should be checked for each
-            %       step taken.
-            %       If it is moved here, then multiple branching stages can be removed in step()
-            %       but this will effectively result in a plotted simulation starting from n = upperBdfOrder.
-            %       In addition, the properties lowerBdfOrder and upperBdfOrder can be removed.
-            % obj.lowerBdfOrder = bdfOrders.lowerBdfOrder;
-            % obj.upperBdfOrder = bdfOrders.upperBdfOrder;
-            % assert((obj.lowerBdfOrder >= 1) && (obj.upperBdfOrder <= 6));
-            % obj.v_prev = [];
-            % obj.DvDt = rv.time.BdfDerivative();
-            % obj.viscosity = zeros(size(v0));
-            % obj.residual = zeros(size(v0));
-            % obj.dvdt = zeros(size(v0));
-            % obj.Df = zeros(size(v0));
-
-            % Using the ODE:
             obj.DvDt = DvDt;
             obj.dvdt = obj.DvDt(obj.v);
             [obj.viscosity, obj.Df] = RV.evaluate(obj.v,obj.dvdt);
@@ -69,17 +51,7 @@
             state = struct('v', obj.v, 'residual', obj.residual, 'dvdt', obj.dvdt, 'Df', obj.Df, 'viscosity', obj.viscosity, 't', obj.t);
         end
 
-        function obj = step(obj)
-            % % Store current time level and update v_prev
-            % numStoredStages = size(obj.v_prev,2);
-            % if (numStoredStages < obj.upperBdfOrder)
-            %     obj.v_prev = [obj.v, obj.v_prev];
-            %     numStoredStages = numStoredStages+1;
-            % else
-            %     obj.v_prev(:,2:end) = obj.v_prev(:,1:end-1);
-            %     obj.v_prev(:,1) = obj.v;
-            % end
-            
+        function obj = step(obj)            
             obj.dvdt = obj.DvDt(obj.v);
             [obj.viscosity, obj.Df] = obj.RV.evaluate(obj.v,obj.dvdt);
             obj.residual = obj.dvdt + obj.Df;
@@ -89,13 +61,6 @@
             obj.v = time.rk.rungekutta(obj.v, obj.t, obj.k, F_visc, obj.coeffs);
             obj.t = obj.t + obj.k;
             obj.n = obj.n + 1;
-
-            % %Calculate dvdt and evaluate RV for the new time level
-            % if ((numStoredStages >=  obj.lowerBdfOrder) && (numStoredStages <= obj.upperBdfOrder))
-            %     obj.dvdt = obj.DvDt.evaluate(obj.v, obj.v_prev, obj.k);
-            %     [obj.viscosity, obj.Df] = obj.RV.evaluate(obj.v,obj.dvdt);
-            %     obj.residual = obj.dvdt + obj.Df;
-            % end
         end
     end
 end
\ No newline at end of file