diff -r 705658c55229 -r e45c9b56d50d +grid/EmptyGrid.m
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/+grid/EmptyGrid.m	Thu Sep 07 09:16:12 2017 +0200
@@ -0,0 +1,45 @@
+classdef EmptyGrid < grid.Grid
+    properties
+        dim
+    end
+
+    methods
+        function obj = EmptyGrid(D)
+            obj.dim = D;
+        end
+        % n returns the number of points in the grid
+        function o = N(obj)
+            o = 0;
+        end
+
+        % d returns the spatial dimension of the grid
+        function o = D(obj)
+            o = obj.dim;
+        end
+
+        % points returns a n x d matrix containing the coordinates for all points.
+        function X = points(obj)
+            X = sparse(0,obj.dim);
+        end
+
+        % Restricts the grid function gf on obj to the subgrid g.
+        function gf = restrictFunc(obj, gf, g)
+            error('Restrict does not make sense for an empty grid')
+        end
+
+        % Projects the grid function gf on obj to the grid g.
+        function gf = projectFunc(obj, gf, g)
+            error('Project does not make sense for an empty grid')
+        end
+
+        % Return the grid.boundaryIdentifiers of all boundaries in a cell array.
+        function bs = getBoundaryNames(obj)
+            bs = {};
+        end
+
+        % Return coordinates for the given boundary
+        function b = getBoundary(obj, name)
+            b = sparse(0,obj.dim-1);
+        end
+    end
+end
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