--- a/+grid/Cartesian.m	Tue Dec 04 14:54:28 2018 -0800
+++ b/+grid/Cartesian.m	Tue Dec 04 15:24:36 2018 -0800
@@ -16,7 +16,7 @@
             obj.d = length(varargin);
 
             for i = 1:obj.d
-                assert(isvector(varargin{i}), 'Coordinate inputs must be a vectors.')
+                assert(isnumeric(varargin{i}), 'Coordinate inputs must be vectors.')
 
                 obj.x{i} = varargin{i};
                 obj.m(i) = length(varargin{i});
@@ -28,7 +28,11 @@
             end
 
             obj.h = [];
-            obj.lim = [];
+
+            obj.lim = cell(1,obj.d);
+            for i = 1:obj.d
+                obj.lim{i} = {obj.x{i}(1), obj.x{i}(end)};
+            end
         end
         % n returns the number of points in the grid
         function o = N(obj)