--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/+time/Cdiff.m	Thu Sep 17 10:12:50 2015 +0200
@@ -0,0 +1,52 @@
+classdef Cdiff < time.Timestepper
+    properties
+        D
+        E
+        S
+        k
+        t
+        v
+        v_prev
+        n
+    end
+
+
+    methods
+        function obj = Cdiff(D, E, S, k, t0, v, v_prev)
+            m = size(D,1);
+            default_arg('E',sparse(m,m));
+            default_arg('S',sparse(m,1));
+
+            if ~(issparse(D) && issparse(E) && issparse(S))
+                warning('One of the matrices D, E, S is not sparse!')
+                print_issparse(D)
+                print_issparse(E)
+                print_issparse(S)
+            end
+
+            obj.D = D;
+            obj.E = E;
+            obj.S = S;
+            obj.k = k;
+            obj.t = t0+k;
+            obj.v = v;
+            obj.v_prev = v_prev;
+        end
+
+        function [v,t] = getV(obj)
+            v = obj.v;
+            t = obj.t;
+        end
+
+        function [vt,t] = getVt(obj)
+            vt = (obj.v-obj.v_prev)/obj.k; % Could be improved using u_tt = f(u))
+            t = obj.t;
+        end
+
+        function obj = step(obj)
+            [obj.v, obj.v_prev] = time.cdiff.cdiff(obj.v, obj.v_prev, obj.k, obj.D, obj.E, obj.S);
+            obj.t = obj.t + obj.k;
+            obj.n = obj.n + 1;
+        end
+    end
+end
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